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If int cos xcdot cos 2 x cdot cos 5 x dx...

If `int cos xcdot cos 2 x cdot cos 5 x dx `
`= A sin 2 x + B sin 4 x + C sin 6x + D sin 8 x + k`
(where `k` is the arbitrary constant of integration), then `1/B + 1/C = `

A

`1/A - 1/D`

B

`1/A+1/D`

C

1

D

0

Text Solution

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The correct Answer is:
B
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