Q.

The definite integral∫−20 x3+3x2+3x+3+(x+1)cos⁡(x+1)dx  equals

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a

– 4

b

0

c

4

d

6

answer is C.

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Detailed Solution

I=∫−20 x3+3x2+3x+3+(x+1)cos⁡(x+1)dx=∫−20 (x+1)3+2+(x+1)cos⁡(x+1)dxPut x + 1 = t therefore,I=∫−11 t3+2+tcos⁡tdt=4∵t3+tcos⁡t is an odd function .
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The definite integral∫−20 x3+3x2+3x+3+(x+1)cos⁡(x+1)dx  equals