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Find the points of inflection for f(x)=...

Find the points of inflection for `f(x)=sinx` `f(x)=3x^4-4x^3` `f(x)=x^(1/3)`

A

x = 1 and x = 2

B

x = 3 and x = -1

C

x = 0 and `x = (2)/(3)`

D

`x = (4)/(5) and x = -1`

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The correct Answer is:
C
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