Given http://webwork.mathstat.concordia.ca...37aea14491.png and http://webwork.mathstat.concordia.ca...6cd2797d21.png, find the exact value of http://webwork.mathstat.concordia.ca...ca01dc2261.png.

Note: You are not allowed to use decimals in your answer. http://webwork.mathstat.concordia.ca...23eadcfd91.png = .

which then is

Where did I go wrong