1，lim(x^2-x-2)/(x^4-4)
(x^2-x-2)/(x^4-4)=(x+1)(x-2)/((x-2)(x+2))=(x+1)/(x+2)
x-->2 lim=3/4
2.y=(x^4)sin(x)
y'=(x^4)'sin(x)+(x^4)sin(x)'
=4(x^3)sin(x)+(x^4)cos(x)
(x^2-x-2)/(x^4-4)=(x+1)(x-2)/((x-2)(x+2))=(x+1)/(x+2)
x-->2 lim=3/4
2.y=(x^4)sin(x)
y'=(x^4)'sin(x)+(x^4)sin(x)'
=4(x^3)sin(x)+(x^4)cos(x)
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