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Evaluate: int(cos2x-cos2alpha)/(cosx-cos...

Evaluate: `int(cos2x-cos2alpha)/(cosx-cosalpha)\ dx`

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`int (cos2x -cos 2alpha)/(cos x- cosalpha)dx`
`= int ((2 cos^(2) x-1)-(2 cos^(2) alpha-1))/(cos x-cos alpha)dx` ltb rgt` =2 int ((cos^(2) x-cos^(2) alpha))/(cos x-cosalpha)dx`
`=2 int (cos x+ cos alpha) dx`
` =2 int cos x dx+ 2 cos alpha int 1 dx`
` =2 sin x + 2x cos alpha +c`
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