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int sin 7 x cos 5xdx = ……….....

`int sin 7 x cos 5xdx = ………..`

A

` 1/2 [(cos 12x)/2 +(cos 2x)/2]c `

B

`-1/2 [(cos 12x)/2 + (cos 2x)/2]+c`

C

` - 1/2 [ (cos 6x)/6 + cos x ] + c `

D

` - 1/2 [(sin 12x)/2 + (sin 2x)/ 2 ] + c `

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