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Evaluate: int1/(sin(x-a)sin(x-b))\ dx...

Evaluate: `int1/(sin(x-a)sin(x-b))\ dx`

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`int frac{1}{sin (x-a) sin (x-b)} cdot d x`
is equal to `frac{1}{sin (b-a)} int frac{sin [(x-a)-(x-b)]}{sin (x-a) sin (x-b)} cdot d x`
` frac{1}{sin (b-a)} int frac{sin (x-a) cos (x-b)-cos (x-a) sin (x-b)}{sin (x-a) sin (x-b)} cdot d x`
` frac{1}{sin (b-a)} int[cot (x-b)-cos (x-a)] cdot d x`
`frac{1}{sin (b-a)} cdot log [frac{sin (x-b)}{sin (x-a)}]+c`
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