So we could put the sine of x there, but it's negative sine of x, so you have a minus and there would be a negative, so we could just make that a positive. And then all of that over the function on the bottom squared. So cosine of x squared. And so zero times cosine of x, that is just zero. And so all we are left with is sine of x over cosine of x squared. And there's multiple ways that you could rewrite this if you like. You could say that this is the same thing as sine of x over cosine of x times one over cosine of x.