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Evaluate: intsinxsin2xsin3x dx...

Evaluate: `intsinxsin2xsin3x dx`

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Evaluate:` ∫sinxsin2xsin3xdx`
=`1/2∫2sin3xsinxsin2xdx`
=`1/2int(cos2x-cos4x)sin2xdx`
=`1/2int(sin2xcos2x-sin2xcos4x)dx`
=`1/4intsin4x-1/4int(2sin2xcos4x)dx`
=`-1/16cos4x-1/4(sin6x-sin2x)dx`
=`-1/16cos4x+1/24cos6x-1/8cos2x+c`
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