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a
−2log22xcot2x+logsin2x+C
b
2log22xcot2x−logsin2x+C
c
2log2logsin2x−2xcot2x+C
d
2log2logsin2x+2xcot2x+C
answer is C.
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Detailed Solution
Let I=∫cosec22x2xdx Put 2x=y⇒122x2xlog2dx=dy⇒2xdx=2ylog2dyI=2log2∫cosec2yydy=2log2y∫cosec2y−∫dydy∫cosec2ydydy=2log2−ycoty+∫cotydy=2log2[−ycoty+logsiny]+C=2log2logsin2x−2xcot2x+C