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Let int x sinx sec^3x dx = 1/2(x.f(x) -...

Let `int x sinx sec^3x dx = 1/2(x.f(x) - g(x)) + k`, then

A

`f (x) cancel (in) (-1,1)`

B

`g (x) =sin x `has 6 solution for `x in [-pi, 2pi]`

C

`g'(x) =f(x),AA x in R`

D

`f (x) gg(x) ` has no solution

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The correct Answer is:
A, C, D
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