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int(cospx+cosqx)/(sinpx+sinqx)dx...

`int(cospx+cosqx)/(sinpx+sinqx)dx`

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`int(cospx+cosqx)/(sinpx+sinqx)dx`
=`int(2cos((p+q)/2)x.cos((p-q)/2)x)/(2sin((p+q)/2)x.cos((p-q)/2)x)dx`
=`intcot((p+q)/2)xdx`
=2/(p+q) Inabs(sin((p+q)/2)x)+C`
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