∫sin来自5Xsin7Xdx
=∫-(1/2)[cos(5x+7x)-cos(5x-7x)]dx
=-(1/2)∫(cos1360问答2x-cos2x)dx
=(-道板杂就1/2)[(1/12)sin12x-(1/2)sin2x]+C
=-(1/24)sin12x+(1/4)sin2x+C
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