Q. If sin A = 1/2, what is the value of A in degrees?
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Solution
sin A = 1/2 corresponds to A = 30°.
Correct Answer: A — 30
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Q. If sin A = 1/√2, what is the value of A?
A.
45°
B.
30°
C.
60°
D.
90°
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Solution
The angle A for which sin A = 1/√2 is A = 45°.
Correct Answer: A — 45°
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Q. If sin A = 3/5, what is the value of cos A?
A.
4/5
B.
3/5
C.
5/4
D.
1/2
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Solution
Using the identity sin^2 A + cos^2 A = 1, we have cos A = sqrt(1 - (3/5)^2) = sqrt(1 - 9/25) = sqrt(16/25) = 4/5.
Correct Answer: A — 4/5
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Q. If sin A = 4/5, what is the value of tan A?
A.
3/4
B.
4/3
C.
5/4
D.
5/3
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Solution
Using the identity tan A = sin A / cos A, we find cos A = 3/5, thus tan A = (4/5) / (3/5) = 4/3.
Correct Answer: B — 4/3
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Q. If sin(2x) = 2sin(x)cos(x), what is the double angle formula for sine?
A.
sin(2x) = sin(x) + cos(x)
B.
sin(2x) = 2sin(x)cos(x)
C.
sin(2x) = sin^2(x) - cos^2(x)
D.
sin(2x) = 2sin^2(x)
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Solution
The double angle formula for sine is sin(2x) = 2sin(x)cos(x).
Correct Answer: B — sin(2x) = 2sin(x)cos(x)
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Q. If sin(2θ) = 2sin(θ)cos(θ), what is this identity called?
A.
Pythagorean Identity
B.
Double Angle Identity
C.
Sum Formula
D.
Product Formula
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Solution
This is known as the Double Angle Identity for sine.
Correct Answer: B — Double Angle Identity
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Q. If sin(x) = 0, what are the possible values of x?
A.
nπ
B.
nπ/2
C.
nπ + π/2
D.
nπ + π
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Solution
sin(x) = 0 at x = nπ, where n is any integer.
Correct Answer: A — nπ
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Q. If sin(x) = 0, what is the value of cos(x)?
A.
1
B.
0
C.
-1
D.
undefined
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Solution
If sin(x) = 0, then cos(x) can be either 1 or -1 depending on the angle x.
Correct Answer: A — 1
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Q. If sin(x) = 0, what is the value of tan(x)?
A.
0
B.
1
C.
undefined
D.
∞
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Solution
tan(x) = sin(x)/cos(x). If sin(x) = 0, then tan(x) is undefined when cos(x) = 0.
Correct Answer: C — undefined
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Q. If sin(x) = 0, what is the value of x?
A.
0
B.
Ï€
C.
2Ï€
D.
All of the above
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Solution
sin(x) = 0 at x = nπ, where n is any integer, hence all of the above.
Correct Answer: D — All of the above
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Q. If sin(x) = 1/2, what are the possible values of x in the interval [0, 2Ï€)?
A.
Ï€/6, 5Ï€/6
B.
Ï€/4, 3Ï€/4
C.
Ï€/3, 2Ï€/3
D.
0, π
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Solution
The angles where sin(x) = 1/2 are x = π/6 and x = 5π/6.
Correct Answer: A — π/6, 5π/6
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Q. If sin(x) = 1/2, what are the possible values of x in [0, 2Ï€]?
A.
Ï€/6, 5Ï€/6
B.
Ï€/4, 3Ï€/4
C.
0, π
D.
Ï€/3, 2Ï€/3
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Solution
sin(x) = 1/2 at x = π/6 and x = 5π/6 in the interval [0, 2π].
Correct Answer: A — π/6, 5π/6
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Q. If sin(x) = 1/2, what is the value of x in degrees?
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Solution
sin(30°) = 1/2, so x = 30°.
Correct Answer: A — 30
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Q. If sin(x) = 1/2, what is the value of x in the interval [0, 2Ï€]?
A.
Ï€/6
B.
5Ï€/6
C.
7Ï€/6
D.
11Ï€/6
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Solution
The angles where sin(x) = 1/2 in the interval [0, 2π] are x = π/6 and x = 5π/6.
Correct Answer: A — π/6
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Q. If sin(x) = 1/2, what is the value of x in the range [0, 2Ï€]?
A.
Ï€/6
B.
Ï€/3
C.
5Ï€/6
D.
7Ï€/6
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Solution
x = π/6 and 5π/6.
Correct Answer: A — π/6
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Q. If sin(x) = 1/√2, what is cos(x)?
A.
1/√2
B.
0
C.
√2/2
D.
1
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Solution
Using the identity sin^2(x) + cos^2(x) = 1, we have cos^2(x) = 1 - (1/√2)^2 = 1 - 1/2 = 1/2. Thus, cos(x) = ±1/√2.
Correct Answer: A — 1/√2
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Q. If sin(x) = 1/√2, what is tan(x)?
A.
1
B.
√2
C.
√3
D.
0
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Solution
tan(x) = sin(x)/cos(x) = (1/√2)/(1/√2) = 1.
Correct Answer: B — √2
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Q. If sin(x) = 1/√2, what is the value of cos(x)?
A.
1/√2
B.
0
C.
√2/2
D.
1
Show solution
Solution
Using the identity sin^2(x) + cos^2(x) = 1, we have cos^2(x) = 1 - (1/√2)^2 = 1 - 1/2 = 1/2. Therefore, cos(x) = 1/√2.
Correct Answer: A — 1/√2
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Q. If sin(x) = 3/5, what is cos(x)?
A.
4/5
B.
3/5
C.
5/4
D.
1/5
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Solution
Using the identity sin^2(x) + cos^2(x) = 1, we have cos^2(x) = 1 - (3/5)^2 = 1 - 9/25 = 16/25. Therefore, cos(x) = ±4/5. The positive value is taken as x is in the first quadrant.
Correct Answer: A — 4/5
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Q. If sin(x) = 3/5, what is the value of cos(x)?
A.
4/5
B.
3/5
C.
5/4
D.
1/5
Show solution
Solution
Using the identity sin^2(x) + cos^2(x) = 1, we have cos^2(x) = 1 - (3/5)^2 = 1 - 9/25 = 16/25. Therefore, cos(x) = ±4/5.
Correct Answer: A — 4/5
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Q. If sin(α) = 0.6, what is the value of cos(α) using the identity?
A.
0.8
B.
0.6
C.
0.4
D.
0.2
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Solution
Using sin^2(α) + cos^2(α) = 1, we find cos(α) = √(1 - 0.6^2) = √(1 - 0.36) = √0.64 = 0.8.
Correct Answer: A — 0.8
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Q. If sin(θ) = 0, what are the possible values of θ in the interval [0, 2π]?
A.
0, π
B.
0, 2Ï€
C.
Ï€/2, 3Ï€/2
D.
Ï€/4, 3Ï€/4
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Solution
The angles where sin(θ) = 0 in the interval [0, 2π] are θ = 0 and θ = π.
Correct Answer: A — 0, π
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Q. If sin(θ) = 0, what are the possible values of θ?
A.
0°, 180°
B.
90°, 270°
C.
45°, 135°
D.
30°, 150°
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Solution
sin(θ) = 0 at θ = 0° and 180°.
Correct Answer: A — 0°, 180°
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Q. If sin(θ) = 1/√2, what is the value of cos(θ)?
A.
1/√2
B.
0
C.
√2/2
D.
1
Show solution
Solution
Using the identity sin^2(θ) + cos^2(θ) = 1, we have cos^2(θ) = 1 - (1/√2)^2 = 1 - 1/2 = 1/2. Thus, cos(θ) = ±1/√2.
Correct Answer: A — 1/√2
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Q. If sin(θ) = 1/√2, what is the value of θ in degrees?
A.
45°
B.
30°
C.
60°
D.
90°
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Solution
sin(θ) = 1/√2 at θ = 45°.
Correct Answer: A — 45°
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Q. If sin(θ) = 1/√2, what is the value of θ in the range [0°, 360°]?
A.
45°, 225°
B.
30°, 150°
C.
60°, 300°
D.
90°, 270°
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Solution
sin(θ) = 1/√2 at θ = 45° and θ = 225°.
Correct Answer: A — 45°, 225°
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Q. If sin(θ) = 1/√2, what is the value of θ?
A.
30°
B.
45°
C.
60°
D.
90°
Show solution
Solution
sin(θ) = 1/√2 at θ = 45°.
Correct Answer: B — 45°
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Q. If sin(θ) = 3/5, what is cos(θ)?
A.
4/5
B.
3/5
C.
5/4
D.
1/5
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Solution
Using the Pythagorean identity, cos(θ) = √(1 - sin²(θ)) = √(1 - (3/5)²) = 4/5.
Correct Answer: A — 4/5
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Q. If sin(θ) = 4/5, what is the value of tan(θ)?
A.
3/4
B.
4/3
C.
5/4
D.
5/3
Show solution
Solution
Using the identity tan(θ) = sin(θ)/cos(θ) and cos(θ) = √(1 - sin^2(θ)), we find cos(θ) = 3/5. Thus, tan(θ) = (4/5)/(3/5) = 4/3.
Correct Answer: A — 3/4
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Q. If sin^(-1)(x) + cos^(-1)(x) = π/2, then the value of x is:
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Solution
The equation sin^(-1)(x) + cos^(-1)(x) = π/2 holds for all x in the domain of the functions, which is [-1, 1]. Therefore, x can be any value in this range.
Correct Answer: A — 0
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