9(90−d)9\left(90-d\right)9(90−d)
−12x+8≥2x−2-12x+8\ge2x-2−12x+8≥2x−2
limx→0(2x4−x2x2)\lim_{x\to0}\left(\frac{2x^4-x^2}{x^2}\right)x→0lim(x22x4−x2)
limx→2(sin(x+2)x2−4)\lim_{x\to2}\left(\frac{\sin\left(x+2\right)}{x^2-4}\right)x→2lim(x2−4sin(x+2))
64x2+32xy+4y264x^2+32xy+4y^264x2+32xy+4y2
x(2−x)2x\left(2-x\right)^2x(2−x)2
limx→3(4x2−36x2+9)\lim_{x\to3}\left(\frac{4x^2-36}{x^2+9}\right)x→3lim(x2+94x2−36)
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