If , then is equal to:
Answer and explanation
Correct answer: A.
- Step 1: Use the product rule with , .
- Step 2: and .
- Step 3: .
Answer
.
Why not the others: Swapping the 2 and 3, or pairing the multipliers with the wrong trig function, breaks the chain rule; a minus sign belongs to the derivative of cosine, not sine.
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