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curved etherical duty y=ax3 + bx2 + c + d with point (0,4) for him and...

curved etherical duty y=ax3 + bx2 + c + d with point (0,4) for him and him with a tipping point; -1,2)the curve tangent at the tipping point is equal to the x-axis, which is the value of a ,b, c, d

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