lim(1-cos(pi*x))/(x^2) x->0

Question

lim(1-cos(pi*x))/(x^2) x->0

Answer 1

1)lim (x->1) cos*((Pi/2)*x)/(1-x) = lim (y->0) cos(pi/2(1-y))/y= lim (y->0)sin((pi/2)y)/y=pi/2
2)lim (x-> PI/2) (1+cosx)^(2sec x) = lim t->~ (1+1/t)^(2t)=e^2
3)1/cosx=t
4)x->п/2 t-> ~ бесконечность

Скорее всего так !!!