1) lim x->INFINITY
arctan(x^6 - x^8)
the answer is -pi/2, but i dont know how to get it
2) on pic (it will have a red number 2 on it)
3) on second pic (it will have a red number 3 on it)
for 2 and 3, both answers are on it, but i have no idea into how to get this
does anyone know?????????