limr→−1r2+2\lim_{r\to-1}r^2+2r→−1limr2+2
16x2+48x=−57616x^2+48x=-57616x2+48x=−576
limx→12+ln(a+x)\lim_{x\to1}2+\ln\left(a+x\right)x→1lim2+ln(a+x)
+71mn−65mn+71mn-65mn+71mn−65mn
(1+cos(x))⋅(1−cos(x))cos(x)=sec(x)−cos(x)\frac{\left(1+\cos\left(x\right)\right)\cdot\left(1-\cos\left(x\right)\right)}{\cos\left(x\right)}=\sec\left(x\right)-\cos\left(x\right)cos(x)(1+cos(x))⋅(1−cos(x))=sec(x)−cos(x)
x2−4x−6x^2-4x-6x2−4x−6
3x=213x=213x=21
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