indefinite-integration

Question: $\int{\frac{dx}{\sin (x-a)\sin (x-b)}}$ is

1) $\frac{1}{\sin (a-b)}\log \left| \frac{\sin (x-a)}{\sin (x-b)} \right|+c$

2) $\frac{-1}{\sin (a-b)}\log \left| \frac{\sin (x-a)}{\sin (x-b)} \right|+c$

3) $\log \sin (x-a)\sin (x-b)+c$

4) $\log \left| \frac{\sin (x-a)}{\sin (x-b)} \right|$

Solution:

Explanation: No Explanation

Integration by substitution

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