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a
1sin(a−b)logsin(x−a)sin(x−b)+C
b
−1sin(a−b)logsin(x−a)sin(x−b)+C
c
logsin(x−a)sin(x−b)+C
d
logsin(x−a)sin(x−b)+C
answer is A.
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Detailed Solution
We have, ∫1sin(x−a)sin(x−b)dx=1sin(b−a)∫sin{(x−a)−(x−b)}sin(x−a)sin(x−b)dx=1sin(b−a)∫{cot(x−b)−cot(x−a)}dx=1sin(b−a){logsin(x−b)−logsin(x−a)}+C=1sin(b−a)logsin(x−b)sin(x−a)+C=1sin(a−b)logsin(x−a)sin(x−b)+C