sin(2x)cos(4x)=2sinxcos(1-2sin2x^)
∫2sinxcosx(1-2sin2x^)dx
=∫2sinx(1-2sin2x^)dsinx
==∫2sinx-4sin2x^3dsinx
=sinx^-sin2x^4 /2+C
sin(2x)cos(4x)的积分是多少
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