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Let f(x)=x|x|. Then the set of points wh...

Let `f(x)=x|x|`. Then the set of points where f(x) is twice differentiable is -

A

`AA x in R`

B

`AA x in R -{0}`

C

`AA x in R-{0,1}`

D

`AA x in R -{1}`

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The correct Answer is:
B
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CHHAYA PUBLICATION-MCQ ZONE -Question Paper 2
  1. If 2^(x)+2^(y)=2^(x+y), then the value of (dy)/(dx) at x=y=1 is -

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  2. If f(x)=x(x-1)(x-2), 0 le x le 4, then the point x=c which satisfies m...

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  3. Let f(x)=x|x|. Then the set of points where f(x) is twice differentiab...

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  4. If x=sin^(-1) t, y=log(1-t^(2)), 0 le t lt 1, then the value of (d^(2...

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  5. If 2a+3b+6c=0 " "(a, b, c in R), then the quadratic equation ax^(2)...

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  6. If y=(x+sqrt(1+x^(2)))^(n), then (1+x^(2))(d^(2)y)/(dx^(2))+x(dy)/(d...

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  7. If sin y+e^(-x cos y)=e, then the value of (dy)/(dx) at (1, pi) is -

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  8. If x=2 cos t+cos 2t and y=2 sin t-sin2t, then the value of (dy)/(dx) a...

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  9. The value of lim(x to oo) (sqrt(x^(2)+ax)-x) is -

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  10. If logx=z, then the value of x^(2)(d^(2)y)/(dx^(2)) is -

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  11. The value of int e^(sqrt(x)) dx is -

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  12. If int x sin x dx = - x cosx +m, then the value of m is -

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  13. The value of int (a^(sqrt(x)))/(sqrt(x))dx is -

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  14. The value of int (e^(tan^(-1)x)dx)/(1+x^(2)) is -

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  15. The value of int(0)^((pi)/(2))(dx)/(1+cotx ) is -

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  16. If I(1)=int(e )^(e^(2)) (dx)/(log x) and I(2)= int(1)^(2)(e^(x))/(x)...

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  17. If I(n)=int(0)^((pi)/(4))tan^(n)thetad theta, for any positive intege...

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  18. The value of int(1)^(2)[x^(2)]dx is -

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  19. The value of int(-pi)^(pi) (2x(1+sinx))/(1+cos^(2)x)dx is equal to -

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  20. The value of int(dx)/(sinx-cosx+sqrt(2)) is -

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