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∫cotx cot(2400−x) cot(2400+x)dx
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a
−13log (sin3x)+c
b
13log (sin3x)
c
13log (sin3x)+C
d
13log (cosec3x)
answer is A.
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Detailed Solution
We know that tanxtan240∘−xtan240∘+x=tan3x∫cotxcot(240−x)cot(240+x)dx=∫cot3xdx=13log(sin3x)+C
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