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If intsqrt(1-cosx)f(x)dx=2/3(1-cosx)^(3/...

If `intsqrt(1-cosx)f(x)dx=2/3(1-cosx)^(3//2)+c` where `c` is constant of integration then `f(x)` equals:

A

`cotx`

B

`x`

C

`sinx`

D

`tanx`

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