So it's 1 1 2. So this is, the denominator is equal to 1 1 2. See, the numerator, this negative cancels out with that negative. And so we are left with, and we deserve a little bit of a drum roll, that we are left with square root of two over two, that's the numerator, divided by 1 1 2. Well, that's the same thing as multiplying by two. So we are left with positive square root of two is the slope of the tangent line to the graph of y is equal to this when x is equal to pi over four. Pi over four, pretty exciting.