And both of these expressions are, if these were function definitions, or if we were to graph y equals one plus square root of two times sine theta, or y equals cosine of two theta, we would get continuous functions, especially at theta is equal to negative pi over four, so we could just substitute in. We say, well, this is going to be equal to, this expression evaluated at negative pi over four, so one plus square root of two times sine of negative pi over four over cosine of two times negative pi over four. Now, negative pi over four, sine of negative pi over four is going to be negative square root of two over two. So this is negative square root of two over two. We're assuming this is in radians. If we're thinking in degrees, this would be a negative 45 degree angle, so this is one of the trig values that it's good to know. And so if you have one, so let's see.