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Substituting t = sin x in (cos x/sin x) dx leads to the family
Aln|sin x| + C
Bln|cosec x| + C
C-ln|sin x| + C
Dln|cos x| + C
Answer & Solution
Correct answer: A. ln|sin x| + C
Writing cot x = cos x/sin x and putting t = sin x gives ln|sin x|.
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