Lesson eLearning

Simplify: sin (90° - A).

medium MCQ Class 10 · Mathematics · Introduction to Trigonometry
  1. cos A
  2. -cos A
  3. tan A
  4. sec A
Answer
cos A

The correct answer is cos A — Complementary angle identity: sin (90° - A) = cos A.

Step-by-step solution

  1. Complementary angle identity: sin (90° - A) = cos A.

Concept tested: Complementary Angles

Published · How this solution was prepared and checked

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