int(cos2x-cos2alpha)/(cosx-cosalpha)dx...

`int(cos2x-cos2alpha)/(cosx-cosalpha)dx`

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`I=int(cos2x-cos2alpha)/(cosx-cosalpha)dx`
=`int((2cos^2x-1)-(2cos^2alpha-1))/(cosx-cosalpha)dx`
=`2int(cosx+cosalpha)dx`
=`2sinx+2xcosalpha+c`

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