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If x = a cos(theta) and y = a sin(theta), then dy/dx is
Atan(theta)
B-tan(theta)
Ccot(theta)
D-cot(theta)
Answer & Solution
Correct answer: D. -cot(theta)
dy/d(theta) = a cos(theta) and dx/d(theta) = -a sin(theta), giving -cot(theta).
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