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Q.

If ⨍(x)=x3 sgn(x),  then

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a

⨍ 1(0+)=2

b

  is continuous but not differentiable at x=0

c

⨍ 1(0-)=1

d

⨍  is derivable at x=0

answer is D.

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Detailed Solution

fx=x2 sin x =-x3        ; x<00             ; x=0x3           ; x>0 f10-=limx0--x3-0x-0=limx0--x2=0 f10+=limx0x3-0x-0=limx0+x2=0f10=f10+  f is differentiable at x=0 f is derivable at x=0

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