alleryd/dx (cos x) is:
A− cos x
Bsin x
C− sin x
Dtan x
Answer & Solution
Correct answer: C. − sin x
1. d/dx (cos x) = − sin x.
2. Notice the minus sign — cos starts at 1 and decreases initially.
_Source: syllabus Maths Ch 13 §13.4 Trig Derivatives_
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