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JEE Mathematics · Easy

Trigonometry: Complementary Angles MCQ

Solve this quality-checked JEE multiple-choice question, then review the correct answer and explanation.

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Complementary AnglesEasyQuestion 200004

Question

sin(90° − θ) is equal to:
  1. A
    sin θ
  2. B
    cos θ
    Correct
  3. C
    −cos θ
  4. D
    tan θ

Correct answer

cos θ

Explanation

sin(90° − θ) = cos θ. This co-function identity swaps sine and cosine when the angle is complementary.

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