The derivative with respect to x of secant of x. Well, secant of x is the same thing as, so we're going to find the derivative with respect to x of, secant of x is the same thing as one over, one over the cosine of x. And that's just the definition of secant. And you could, there's multiple ways you could do this. When you learn the chain rule, that actually might be a more natural thing to use to evaluate the derivative here. But we know the quotient rule, so we will apply the quotient rule here. And it's no coincidence that you get to the same answer.