Given http://webwork.mathstat.concordia.ca...d4cc3990b1.png and http://webwork.mathstat.concordia.ca...31d28e5821.png is in quadrant III, find the exact value of http://webwork.mathstat.concordia.ca...f43f6e9341.png.

Note: You are not allowed to use decimals in your answer. http://webwork.mathstat.concordia.ca...cee78702d1.png =

I need help with the math after this??