In a previous video, we used the quotient rule in order to find the derivatives of tangent of x and cotangent of x. And what I want to do in this video is to keep going and find the derivatives of secant of x and cosecant of x. So let's start with secant of x. 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.