limt→0(−2sin(5t9)3t)\lim_{t\to0}\left(\frac{-2\sin\left(5t^9\right)}{3t}\right)t→0lim(3t−2sin(5t9))
n3−n2−4n+4n2−n−2\frac{n^3-n^2-4n+4}{n^2-n-2}n2−n−2n3−n2−4n+4
tan(x−y)+tan(y)1−tan(x−y)⋅tan(y)=tan(x)\frac{tan\left(x-y\right)+tan\left(y\right)}{1-tan\left(x-y\right)\cdot tan\left(y\right)}=\tan\left(x\right)1−tan(x−y)⋅tan(y)tan(x−y)+tan(y)=tan(x)
−5a−8-5a-8−5a−8
(2x2y.4m)3\left(2x^2y.4m\right)^3(2x2y.4m)3
limx→1(x3−x−1x−1)\lim_{x\to1}\left(\frac{x^3-x-1}{x-1}\right)x→1lim(x−1x3−x−1)
400⋅60400\cdot60400⋅60
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