$-6x^4-3x^3+5x^4-x-4$
$\lim_{x\to-1}\left(-\frac{x^2-1}{x+1}\right)$
$4\cdot7-6$
$6x-9=5x+2$
$\int\left(cos\left(6-2x\right)\right)dx$
$\cos^2\left(x\right)\cdot\sec^2\left(x\right)\cdot\tan^2\left(x\right)\cdot\csc^2\left(x\right)=\sec^2\left(x\right)$
$-2^2+12x+x-52^2+152^2+8$
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