Cos4x(sin5x+3x)=cotx(sin5x-sin3x)
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cot4x(sin5x+3x)=cotx(sin5x-sin3x)
cot4x (2sin4x.cosx)
cos4x/sin4x(2sin4x.cosx)
2cos4x(cosx/sinx)sinx
cotx(2cos4x.sinx)
cotx(sin(4x+x)-sin(4x-x)
cotx(sin5x-sin3x)
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