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Question

Evaluate cos(xa)sin(x+a)dx

A
cos2alog|sin(x+a)|sin2ax+c
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B
cos2alog|sin(x+a)|+sin2ax+c
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C
cos2alog|sin(x+a)|sinax+c
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D
cos2alog|sin(x+a)|+sinax+c
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Solution

The correct option is A cos2alog|sin(x+a)|+sin2ax+c
cos(xa)sin(x+a)dx=cos[(xa)2a]sin(x+a)dx=[cos(xa)cos2a+sin(x+a)sin2a]sin(x+a)dx=[cos(xa)cos2asin(x+a)sin(x+a)sin2asin(x+a)]dx=[cos2acot(xa)+sin2a]dx=cos2acot(x+a)dx+sin2a1dx=cos2alog|sin(x+a)|+sin2ax+c

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