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Evaluate: (i) int(sin(x-a))/(sin(x-b))\ ...

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

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(i) `int(sin(x-a))/(sin(x-b))\ dx`
= `int(sin(x-a+b-b))/(sin(x-b))\ dx`
= `int(sin(x-a)cos(b-a)+cos(x-a)sin(b-a))/(sin(x-b))\ dx`
`=int(cos(b-a)dx+int cot(x-b)sin(b-a)dx`
`=xcos(b-a)+sin(b-a)log(sin|x-b|)`
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