QUOTIENTS

Theorem 5. At a point where the denominator is not equal to zero, the derivative of the quotient of two differentiable func­tions of x is equal to the denominator times the derivative of the numerator minus the numerator times the derivative of the denominator, all divided by the square of the denominator.

If

then

EXAMPLE. Find the derivative of the function

SOLUTION.- The derivative of the numerator is 2x, and the derivative of the denominator is 2. Therefore,

PRACTICE PROBLEMS:

Find the derivatives of the following:

ANSWERS:

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