allery$\displaystyle\int \cos x\,dx$ equals:
A$-\cos x + C$
B$\cos x + C$
C$\sin x + C$
D$-\sin x + C$
Answer & Solution
Correct answer: C. $\sin x + C$
Since d/dx(sin x) = cos x, ∫cos x dx = sin x + C.
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