IfI(m , n)=intcos^m xsinn xdx , then 7I(...

`IfI_(m , n)=intcos^m xsinn xdx , then 7I_(4,3)-4I_(3,2)" is equal to"` (a) constant (b) `-cos^2x+C` (c) `-cos^4xcos3x+C` (d) `cos7x-cos4x+C`

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