expand (x+1)^2 limit x->0+ ln(x) solve over ℝ: (x-1)(x^2+1)=0 expand (a+b)^2 limit x->0 (1-cos(x))/x^2 sin(30°) lim(sqrt(16*x^4+sin(x))/x, x->+inf) lim(1/x,x->0,"right")