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The curve y=ax^3+bx^2+cx+d cut y axis at...

The curve `y=ax^3+bx^2+cx+d` cut y axis at (0.5) where gradient is 3 curve touches x axis at `(-2.o)` then `[a]+[b]+[c]+[d]`=(where [] is GIF)

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PATHFINDER-APPLICATION OF DERIVATIVE-QUESTION BANK
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