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Question

If the integral 5tanxtanx2dx=x+ a ln |sinx2cosx|+k then a is equal to:

A
1
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B
2
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C
1
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D
2
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Solution

The correct option is C 2
I=5tanxtanx2dx
I=5sinxsinx2cosxdx
I=2(cosx+2sinx)+(sinx2cosx)sinx2cosxdx
I=2cosx+2sinxsinx2cosxdx+ dx+k
I=2log|sinx2cosx|+x+k
a=2

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