812⋅x8y4\sqrt[2]{81}\cdot x^8y^4281⋅x8y4
limx→2(x2+1)(x2+4x)\lim_{x\to2}\left(x^2+1\right)\left(x^2+4x\right)x→2lim(x2+1)(x2+4x)
x+6≤3x+6\le3x+6≤3
(m3+4)3\left(m^3+4\right)^3(m3+4)3
sec2x−tan4x\sec^2x-\tan^4xsec2x−tan4x
limx→−1(9x+1)2\lim_{x\to-1}\left(9x+1\right)^2x→−1lim(9x+1)2
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