Differentiate using the Quotient Rule which states that is where and .

The derivative of with respect to is .

Move to the left of .

Rewrite as .

Differentiate using the Power Rule which states that is where .

Multiply by .

Factor out of .

Factor out of .

Factor out of .

Rewrite as .

Move the negative in front of the fraction.

Find the Derivative – d/dx y=(cos(x))/x