$\frac{x^{4}+4x^{3}+8x^{2}-7x+2}{x^{2}-2x-1}$
$-9\:\cdot100$
$-5\left(2\right)^2+14\left(2\right)\left(-3\right)$
$\left(1+\cos\left(x\right)\right)\cdot\left(1-\cos\left(x\right)\right)=\tan\left(x\right)\cdot\sin\left(x\right)\cdot\cos\left(x\right)$
$\int_2^{\infty}\left(\frac{3}{x\ln\left(x\right)}\right)dx$
$x-19=-39$
$4y-7=5$
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