So now let's do cosecant. So the derivative with respect to x of cosecant of x, well, that's the same thing as the derivative with respect to x of one over sine of x. Cosecant is one over sine of x. I remember that, because you think it's cosecant, maybe it's the reciprocal of cosine, but it's not, it's the opposite of what you would expect. Cosine's reciprocal isn't cosecant, it is secant. Once again, opposite of what you would expect. That starts with an S, this starts with a C. That starts with a C, that starts with an S. Just the way that it happened to be defined. But anyway, let's just evaluate this. Once again, we'll do the quotient rule, but you could also do this using the chain rule.