x=120; y=79.; a=16/9; cot(x * pi/360)/cot(y * pi/360) * ((360 atan(1/a tan(x * pi/360)))/pi)/((360 atan(1/a tan(y * pi/360)))/pi)

Uh oh! Wolfram|Alpha doesn't run without JavaScript.

Please enable JavaScript. If you don't know how, you can find instructionshere.Once you've done that, refresh this page to start using Wolfram|Alpha.