Inverse trigonometric functions
Solution
cos^(-1)(0) = π, since cos(π) = 0.
Correct Answer: C — π
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Q. Evaluate sin^(-1)(sin(π/4)).
-
A.
π/4
-
B.
3π/4
-
C.
π/2
-
D.
0
Solution
sin^(-1)(sin(π/4)) = π/4
Correct Answer: A — π/4
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Q. Evaluate tan(sin^(-1)(1/√2)).
Solution
If sin(x) = 1/√2, then x = π/4, thus tan(sin^(-1)(1/√2)) = tan(π/4) = 1.
Correct Answer: A — 1
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Q. Evaluate tan^(-1)(√3).
-
A.
π/3
-
B.
π/4
-
C.
π/6
-
D.
π/2
Solution
tan^(-1)(√3) = π/3, since tan(π/3) = √3.
Correct Answer: A — π/3
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Q. Evaluate the expression sin^(-1)(x) + cos^(-1)(x).
-
A.
0
-
B.
π/2
-
C.
π
-
D.
undefined
Solution
sin^(-1)(x) + cos^(-1)(x) = π/2 for all x in the domain [-1, 1].
Correct Answer: B — π/2
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Q. Evaluate the expression sin^(-1)(x) + sin^(-1)(√(1-x^2)).
-
A.
π/2
-
B.
π/4
-
C.
π/3
-
D.
0
Solution
Using the identity sin^(-1)(x) + sin^(-1)(√(1-x^2)) = π/2 for x in [0, 1], the value is π/2.
Correct Answer: A — π/2
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Q. Evaluate the expression: 2sin^(-1)(1/2) + 2cos^(-1)(1/2).
Solution
2sin^(-1)(1/2) = 2(π/6) = π/3 and 2cos^(-1)(1/2) = 2(π/3) = 2π/3. Therefore, the total is π/3 + 2π/3 = π.
Correct Answer: A — π
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Q. Evaluate \( \cos(\cos^{-1}(\frac{3}{5})) \).
-
A.
0
-
B.
\( \frac{3}{5} \)
-
C.
1
-
D.
undefined
Solution
By definition, \( \cos(\cos^{-1}(x)) = x \). Therefore, \( \cos(\cos^{-1}(\frac{3}{5})) = \frac{3}{5} \).
Correct Answer: B — \( \frac{3}{5} \)
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Q. Find the value of cos(tan^(-1)(3/4)).
-
A.
4/5
-
B.
3/5
-
C.
5/4
-
D.
3/4
Solution
Using the identity, cos(tan^(-1)(3/4)) = 4/5
Correct Answer: A — 4/5
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Q. Find the value of cos^(-1)(0).
Solution
cos^(-1)(0) = π/2, since cos(π/2) = 0.
Correct Answer: B — π/2
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Q. Find the value of sin^(-1)(√3/2) + cos^(-1)(1/2).
-
A.
π/3
-
B.
π/2
-
C.
π/4
-
D.
π/6
Solution
sin^(-1)(√3/2) = π/3 and cos^(-1)(1/2) = π/3. Therefore, the sum is π/3 + π/3 = 2π/3.
Correct Answer: A — π/3
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Q. Find the value of \( \sin(\sin^{-1}(\frac{1}{2})) \).
-
A.
0
-
B.
\( \frac{1}{2} \)
-
C.
1
-
D.
undefined
Solution
By definition, \( \sin(\sin^{-1}(x)) = x \). Therefore, \( \sin(\sin^{-1}(\frac{1}{2})) = \frac{1}{2} \).
Correct Answer: B — \( \frac{1}{2} \)
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Q. If x = cos^(-1)(-1/2), what is the value of x?
-
A.
π/3
-
B.
2π/3
-
C.
π/4
-
D.
π/6
Solution
x = cos^(-1)(-1/2) = 2π/3
Correct Answer: B — 2π/3
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Q. If x = cos^(-1)(1/2), then the value of sin(x) is:
Solution
If x = cos^(-1)(1/2), then x = π/3. Therefore, sin(x) = sin(π/3) = √3/2.
Correct Answer: B — √3/2
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Q. If x = cos^(-1)(1/2), then what is the value of sin(x)?
Solution
If x = cos^(-1)(1/2), then cos(x) = 1/2, which corresponds to x = π/3. Therefore, sin(x) = sin(π/3) = √3/2.
Correct Answer: B — √3/2
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Q. If x = cos^(-1)(1/2), what is sin(x)?
Solution
If x = cos^(-1)(1/2), then x = π/3, thus sin(x) = sin(π/3) = √3/2.
Correct Answer: A — √3/2
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Q. If x = sin^(-1)(-1), then the value of x is:
Solution
sin^(-1)(-1) corresponds to the angle -π/2.
Correct Answer: A — -π/2
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Q. If x = sin^(-1)(-1), what is the value of x?
Solution
sin^(-1)(-1) corresponds to the angle -π/2.
Correct Answer: A — -π/2
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Q. If x = sin^(-1)(1/2), then the value of cos(x) is:
Solution
If x = sin^(-1)(1/2), then x = π/6. Therefore, cos(x) = cos(π/6) = √3/2.
Correct Answer: B — √3/2
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Q. If x = sin^(-1)(1/3), then what is the value of cos(x)?
-
A.
√(8)/3
-
B.
√(2)/3
-
C.
1/3
-
D.
2/3
Solution
Using the identity cos(x) = √(1 - sin^2(x)), we find cos(sin^(-1)(1/3)) = √(1 - (1/3)^2) = √(8)/3.
Correct Answer: A — √(8)/3
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Q. If x = tan^(-1)(1), then the value of x is:
Solution
tan^(-1)(1) = π/4.
Correct Answer: A — π/4
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Q. If x = tan^(-1)(1/√3), what is the value of x?
-
A.
π/6
-
B.
π/4
-
C.
π/3
-
D.
0
Solution
tan^(-1)(1/√3) = π/6, since tan(π/6) = 1/√3.
Correct Answer: A — π/6
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Q. If y = cos^(-1)(x), then dy/dx is:
-
A.
-1/√(1-x^2)
-
B.
1/√(1-x^2)
-
C.
0
-
D.
1
Solution
The derivative of cos^(-1)(x) is dy/dx = -1/√(1-x^2).
Correct Answer: A — -1/√(1-x^2)
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Q. If y = sin^(-1)(x), then what is the derivative dy/dx?
-
A.
1/√(1-x^2)
-
B.
1/(1-x^2)
-
C.
√(1-x^2)
-
D.
1/x
Solution
The derivative of y = sin^(-1)(x) is dy/dx = 1/√(1-x^2).
Correct Answer: A — 1/√(1-x^2)
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Q. If y = sin^(-1)(x), then x = sin(y) implies:
-
A.
y = x
-
B.
y = -x
-
C.
y = 1-x
-
D.
y = 1+x
Solution
By definition, if y = sin^(-1)(x), then x = sin(y).
Correct Answer: A — y = x
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Q. If y = sin^(-1)(x), what is the second derivative d^2y/dx^2?
-
A.
0
-
B.
1/√(1-x^2)^3
-
C.
-1/√(1-x^2)^3
-
D.
undefined
Solution
The second derivative d^2y/dx^2 = -1/√(1-x^2)^3.
Correct Answer: C — -1/√(1-x^2)^3
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Q. If y = tan^(-1)(x), then the range of y is:
-
A.
(-π/2, π/2)
-
B.
(0, π)
-
C.
(-π, π)
-
D.
[0, 1]
Solution
The range of y = tan^(-1)(x) is (-π/2, π/2).
Correct Answer: A — (-π/2, π/2)
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Q. If y = tan^(-1)(x), then what is the second derivative d^2y/dx^2?
-
A.
0
-
B.
-2/(1+x^2)^2
-
C.
2/(1+x^2)^2
-
D.
1/(1+x^2)
Solution
The first derivative dy/dx = 1/(1+x^2). The second derivative d^2y/dx^2 = -2/(1+x^2)^2.
Correct Answer: B — -2/(1+x^2)^2
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Q. If \( y = \cot^{-1}(x) \), what is \( \frac{dy}{dx} \)?
-
A.
\( -\frac{1}{1+x^2} \)
-
B.
\( \frac{1}{1+x^2} \)
-
C.
0
-
D.
undefined
Solution
The derivative of \( y = \cot^{-1}(x) \) is \( -\frac{1}{1+x^2} \).
Correct Answer: A — \( -\frac{1}{1+x^2} \)
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Q. If \( y = \sec^{-1}(x) \), what is \( \frac{dy}{dx} \)?
-
A.
\( \frac{1}{
-
B.
x
-
C.
\sqrt{x^2-1}} \)
-
D.
\( \frac{1}{x\sqrt{x^2-1}} \)
-
.
0
-
.
undefined
Solution
The derivative of \( y = \sec^{-1}(x) \) is \( \frac{1}{|x|\sqrt{x^2-1}} \).
Correct Answer: B — x
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