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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(1)/(sin(x-a)sin(x-b))dx`
`=(1)/(sin(a-b))int(sin{(x-b)-(x-a)})/(sin(x-a)sin(x-b))dx`
`=(1)/(sin(a-b))xxint(sin(x-b)cos(x-a)-cos(x-b)sin(x-a))/(sin(x-a)sin(x-b))dx`
`=(1)/(sin(a-b))int{cot(x-a)-cot(x-b)}dx`
`=(1)/(sin(a-b)){log|sin(x-a)|-log|sin(x-b)|}+c`
`=("cosec"(a-b))log|(sin(x-a))/(sin(x-b))|+c`
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