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Indian Navy INET Trigonometric Functions — practice questions

Explore 1 free Trigonometric Functions questions in Indian Navy INET Mathematics. Open each question or exercise to read its content, reference answers and available explanation.

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Trigonometric Functions questions and exercises with answers

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The double angle formula sin 2A equals:Read the answer and worked solution →

Worked practice questions

The double angle formula sin 2A equals:

  1. $\sin A + \cos A$ (incorrect sum)
  2. $2 \sin A \cos A$ (the correct formula)
  3. $\sin^2 A - \cos^2 A$ (resembles cos 2A)
  4. $2 \sin^2 A$ (only partial)
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Correct answer: B. $2 \sin A \cos A$ (the correct formula)

sin 2A = 2 sin A cos A. Comes from sin(A+A) = sin A cos A + cos A sin A. cos 2A has multiple equivalent forms: cos²A − sin²A = 2cos²A − 1 = 1 − 2sin²A.

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