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Question

If =∣ ∣ ∣exsinx1cosxln(1+x2)1xx21∣ ∣ ∣=a+bx+cx2 then the value of b is


A

0

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B

-1

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C

-2

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D

None of these

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Solution

The correct option is B

-1


=∣ ∣ ∣exsinx1sinxln(1+x2)11x21∣ ∣ ∣+∣ ∣ ∣excosx1cosx2x1+x21x2x1∣ ∣ ∣+0=b+2cx
Now use x=0
b=∣ ∣101001101∣ ∣+∣ ∣111101001∣ ∣=1


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