1. The problem statement, all variables and given/known data Come up with a set of equations to draw the following picture: http://img197.imageshack.us/img197/7428/equation.jpg [Broken] 2. Relevant equations 3. The attempt at a solution The circle is easy. 1000 = sqrt(x^2+y^2) I can just model the equation with sines. So y_1 = 300 * Sin(pi * x / 1000) (Assuming 300 is the highest point in the curve) The sine graph on the y axis can be easily tilted by switching x and y. Therefore: x = 300 * Sin(pi*y_2 / 1000) sin^-1 (x/300) = pi * y_2 / 1000 y_2 = (1000/pi) * sin^-1(x/300) Is my y_2 correct? And I'm kinda stumbling on how to translate the axis in 45 degree angle to draw the sine graph like that. Any help would be appreciated.