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If intsqrt(1+sinx) + f(x) dx = 2/3(1 + s...

If `intsqrt(1+sinx) + f(x) dx = 2/3(1 + sin x)^(3//2) + c`, then `f(x)` is equal to:

A

cos x

B

sin x

C

tan x

D

1

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The correct Answer is:
A
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