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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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12y ago

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