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A curve with equation of the form y=a x^...

A curve with equation of the form `y=a x^4+b x^3+c x+d` has zero gradient at the point `(0,1)` and also touches the `x` -axis at the point `(-1,0)` then `a=3` b. `b=4` c. `c+d=1` d. for `x<-1` , the curve has a negative gradient

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RESONANCE DPP-JEE MAINS-All Questions
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