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What is the value of cos(90°)?

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Question: What is the value of cos(90°)?

Options:

  1. 0
  2. 1
  3. -1
  4. undefined

Correct Answer: 0

Solution: 

cos(90°) = 0.

What is the value of cos(90°)?

Practice Questions

Q1
What is the value of cos(90°)?
  1. 0
  2. 1
  3. -1
  4. undefined

Questions & Step-by-Step Solutions

What is the value of cos(90°)?
Correct Answer: 0
  • Step 1: Understand that 'cos' refers to the cosine function, which is a trigonometric function.
  • Step 2: Know that angles can be measured in degrees, and 90° is a specific angle.
  • Step 3: Recall the unit circle, which helps us understand the values of trigonometric functions at different angles.
  • Step 4: Locate 90° on the unit circle. It is at the top of the circle, where the coordinates are (0, 1).
  • Step 5: The cosine of an angle is the x-coordinate of the point on the unit circle at that angle.
  • Step 6: Since the x-coordinate at 90° is 0, we find that cos(90°) = 0.
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