And transcendental functions is just a fancy word for these functions like trigonometric functions, logarithmic functions that don't use standard algebraic operations. But when you see transcendental functions like this or compositions of them, many people confuse this with the product of functions. So at first when they look at this, they might see this as a product of functions. When they look at this, they might see this as being the same as the derivative with respect to x of natural log of x, natural log of x times sine of x. And you can see just the way that it's written, they look very similar. But this is the product of two functions. If you said natural log of x is f of x and sine of x is g of x, this is the product of sine and g of x.