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f:RtoR is defined as f(x)=x^(3)+2x^(2)+7...

`f:RtoR` is defined as `f(x)=x^(3)+2x^(2)+7x+cos(pix)` and `g` be the inverse of function `f(x)` then `g(9)` is equal to

A

`1/14`

B

`1/10`

C

`2/9`

D

`0`

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