Cosine of pi over four, we revert to our unit, or we think about our unit circle. We're in the first quadrant. If you think in degrees, it's a 45 degree angle. That's going to be square root of two over two. And so we can subtract square root of two over two from both sides, which is going to give us sine of x is equal to, well, if you take square root of two over two from square root of two, you're taking half of it away, so you're gonna have half of it less. So square root of two over two. And so what x value, when I take the sine of it, and remember, where the angle, if we're thinking of the unit circle, it's going to be in that first quadrant.