And then plus the derivative of 4 sine of 2x, well it's 2 times 4, which is 8 times cosine of 2x. Derivative of sine of 2x is 2 cosine of 2x. And that first 2 gets multiplied by the 4 to get the 8. And then the derivative of the denominator, derivative of sine of x is just cosine of x. So let's evaluate this character. It looks like we've made some headway, or maybe L'Hopital's rule will stop applying here because we take the limit as x approaches 0 of cosine of x. That is 1.