求∫dx/sinxcos4x.

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问题 求∫dx/sinxcos4x.

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答案∫dx/sinxcos4x=∫(sin2x+cos2x)/sinxcos4xdx=∫sin2x/sinxcos4xdx+∫cos2x/sinxcos4xdx=-∫d(cosx)/cos4x+∫1/sinxcos2xdx=1/3cos3x+∫(sin2x+cos2x)/sinxcos2xdx=1/3cos3x-∫d(cosx)/cos2x+∫cscxdx=1/3cos3x+1/cosx+ln|cscx-cotx|+C.

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