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If f(x)=x^3+bx^2+cx+d and 0ltb^2ltc then...

If `f(x)=x^3+bx^2+cx+d` and `0ltb^2ltc` then in `(-oo,oo)`

A

f(x) is striclly increasing function

B

f(x) has a local maxima

C

f(x) is a stricly decreasing function

D

f(x) is unbounded

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A
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