I split it up into the limit as x --> pi of
tan^2x + cot^2x[quote]
??? , not " " and , not . Did you not notice that, at the first is but you "split" formula has value 2?
I think you would be better advised to write it as .
tan^2x = 1 - 1/cos^2x
in the limit x --> pi 1--1 = 2
for the cot^2 one
cot^2x = 1/tan^2x
i used the double angle formula and simplified to
then the infinities of tanx/tan2x cancel out so your left with 1/(1-2) = -1
i don't know how to more formally do the cot one!