how do you work out cot squared feta - CSC squared feta?
Is feta an Italian version of Greek Theta?
ctn^2T-csc^2T
cos^2/sin^2 - 1/sin^2
(cos^2T-1)/(sin^2T)
but sin^2T+cos^2T=1 so
-sin^2T/Sin^2T= -1
ctn^2T-csc^2T
cos^2/sin^2 - 1/sin^2
(cos^2T-1)/(sin^2T)
but sin^2T+cos^2T=1 so
-sin^2T/Sin^2T= -1