Posted by John on Saturday, April 21, 2012 at 7:42pm.
5^2+12^2 = h^2 25+144 = h^2 = 169 so hypotenuse = h = 13 sin e = -5/13 cos e = 12/13 sin(e/2) = -sqrt( [1-cos e] /2 ) sin(e/2) = -sqrt (1/13/2) = -sqrt(1/26)
Thank you!!!!