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Q.

Let f(x)=ex-x and g(x)=x2-x, xR. Then the set of al xR, where the function h(x)=fog(x) is increasing, is:

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a

-12,0[1,)

b

-1,12[12,)

c

[0, )

d

0,12[1,)

answer is D.

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Detailed Solution

f(x)=ex-x g(x)=x2-x h(x)=fog(x)         =f(g(x))           =f(x2-x)           =ex2-x-(x2-x) h'(x)=ex2-x(2x-1)-(2x-1)      =(2x-1)(ex2-x-1) h(x) is increasing h'(x)>0 (2x-1)(ex2-x-1)>0 case 1: 2x-1>0          ex2-x<1 x<12       x2-x<0 x(0,12) x(0,12)(1,)  

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