Quotient rule.
d/dx[f(x)/g(x)]
=
g(x)f'(x) - f(x)g'(x)/[g(x)]2
d/dx[X3/10X2]
10X2*3X2 - X3*20X/(10X2)2
30X4 - 20X4/(10X2)2
10X4/10X4
= 1
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x(x + 9)(x + 1)
x cubed
526
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x cubed, or x^3 x(x2)= x3