Shift it to the left by pi over two. And I'm also gonna shift the blue graph to the left by pi over two. And so what am I going to get? Well, the blue graph is gonna look like this one right over here. And if it was cosine of x up here, we can now say that this is equal to, y is equal to cosine of x plus pi over two. This is the blue graph, cosine of x, shifted to the left by pi over two. And this is y is equal to sine of x plus pi over two.