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Theorem 1

THEOREM 1

If n is a positive integer and

y = x1/n,

then

02_differentiation-234.gif

Remember that y = x1/n is defined for all x if n is odd and for x > 0 if n is even. The derivative

02_differentiation-235.gif

is defined for x ≠ 0 if n is odd and for x > 0 if n is even.

If we are willing to assume that dy/dx exists, then we can quickly find dy/dx by the Inverse Function Rule.

02_differentiation-236.gif


Last Update: 2006-11-05