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Q.

The set of points where f(x)=(x-1)2(x+|x-1|) is thrice  differentiable, is

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a

R

b

R-{0}

c

R-{1}

d

R-{0,1}

answer is C.

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Detailed Solution

Since |x| is not diff. at x=0⇒|x−1| is not diff at x=1 . xn|x| is n times diff. at x=0∴x-12|x−1| is twice diff. at x=1 but not thrice diff. at x=1
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