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Question : 70 of 160
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Solution:
‌‌ Let ‌t=∫‌‌dx‌=‌‌∫‌‌dx+‌‌∫‌‌dx‌I=I1+I2(‌ Let ‌)‌‌...‌ (i) ‌Let
I1=‌‌∫‌‌dxLet
x2+x+1=t2(2x+1)dr‌=2‌dtt1‌=‌‌∫‌‌=∫dt=t=√x2+x+1I2‌=‌‌∫‌dr‌=‌‌∫‌‌dxLet
x+‌=cos‌dx=dxf2‌=‌‌∫‌‌=‌ sinh−1(‌)‌=‌ sinh−1(‌)Hence.
I=√x2+x+1+‌ sinh−1(‌)+C
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