So we should still be able to say that the derivative with respect to x of the red graph, sine of x plus pi over two, that that is equal to the blue graph. That that is equal to cosine of x plus pi over two. Now what is sine of x plus pi over two? Well, that's the same thing as cosine of x. So as you can see, this red graph is the same thing as cosine of x. We know that from our trig identities, and you can also see it intuitively or graphically just by looking at these graphs. And what is cosine of x plus pi over two?