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Evaluate: `intsin^(4)xcos^(2)xdx`

Answer» `intsin^(4)xcos^(2)dx=1/8int4sin^(2)xcos^(2)x.2sin^(2)xdx=1/8intsin^(2)2x(1-cos2x)dx`
`=1/8intsin^(2)2dx-1/8intsin^(2)2xcos2xdx=1/16 int(1-cos4x)dx-1/48(sin2x)^(3)`
`=x/16 -(sin4x)/(64) -1/48 (sin2x)^(3)+C`


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