∫x(csc4x)^2dx
=1/4∫x(csc4x)^2d4x
=-1/4∫xdcot4x
=-1/4xcot4x+1/4∫cot4xdx
=-1/4xcot4x+1/16∫cos4x/sin4xd4x
=-1/4xcot4x+1/16ln|sin4x| + C
=1/4∫x(csc4x)^2d4x
=-1/4∫xdcot4x
=-1/4xcot4x+1/4∫cot4xdx
=-1/4xcot4x+1/16∫cos4x/sin4xd4x
=-1/4xcot4x+1/16ln|sin4x| + C
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