lim ( 6x^4/x^4 - 2x^3/x^4 -1/x^4 ) / (5x^4+x^4) = 6/5=1 1/5 =1,2
lim (x-2)(x+2)/(x-2) = lim (x+2) = 2+2=4
x->2
lim ( 6x^4/x^4 - 2x^3/x^4 -1/x^4 ) / (5x^4+x^4) = 6/5=1 1/5 =1,2
lim (x-2)(x+2)/(x-2) = lim (x+2) = 2+2=4
x->2