evaluate lim 1/x² -cot²x while x tends to zero

hey man i think its not that easy as it looks

we have apply the sereis  in

1/x²-1/tan²x

now put the sereis of tan x

(1/x² )-1/(x-x³/3)

on further solving we get lim x tends to 0 1/x²-cot ²x=9/6=2/3

further calculation is very easy i m running out of time thats y not writing it

hope u got it....