$3\log\left(x-1\right)=\log\left(8\right)$
$\frac{1+\cos\left(a\right)-\sin\left(a\right)}{1+\cos\left(a\right)+\sin\left(a\right)}=\sec\left(a\right)-\tan\left(a\right)$
$\left(+2\right)\left(-4\right)\left(-2\right)\left(-1\right)$
$\left(x^3-7x+5\right)\left(x^2-2x+3\right)$
$\left(a-7\right)\left(a+2\right)$
$\left(-8\right)\cdot\left(-10\right)-\left(-5\right)\cdot\left(+6\right)+\left(-9\right)\cdot\left(+4\right)$
$300-40x-300e^{-\frac{x}{5}}$
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