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Q.

If x>o then log(1+x)-2x1+x is

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a

cannot be determined

b

increasing

c

oscillating

d

decreasing

answer is C.

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Detailed Solution

x>0 fx=log1+x-2x1+x f'x=11+x-1+x2-2x11+x2 =11+x-2+2x-2x1+x2

=11+x-21+x2 =1+x-21+x2 =x-11+x2 f'x>0x-1>0                    x>1 f'x<0x-1<0                   x<1

x0,1 is decreasing and x1, is increasing.

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