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Question

If integral dx(secx+cosecx+tanx+cotx)2=xa+2cosx+p4b+cos2xc+d, then a+b+c is equal to

A
-2
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B
-4
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C
2
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D
none of these
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Solution

The correct option is B -4
clearly, I=sin2xcos2x(sinx+cosx+1)2dx=14((sinx+cosx)21)2(sinx+cosx+1)dx=14(sinx+cosx1)2dx On simplifying a + b + c = - 4

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