d/dx (sin x) is:
Acos x
B− cos x
Ctan x
D− sin x
Answer & Solution
Correct answer: A. cos x
1. d/dx (sin x) = cos x.
2. Companions: d/dx (cos x) = −sin x; d/dx (tan x) = sec²x.
_Source: NCERT Class 11 Maths Ch 13 §13.4 Trig Derivatives_
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