Question Detail
Question
Find \( dy/dx \) for \( x = \sin t, y = \cos 2t \).
Correct Answer
Option A is the correct answer.
Detailed Explanation
( dy/dt = -2\sin 2t = -4\sin t \cos t ). ( dx/dt = \cos t ). Result is ( -4\sin t ).
Hint
Use double angle identity for \( \sin 2t \) before dividing derivatives.