$\left(2x^{4}-4x^{3}+x-3\right):\left(x+2\right)$
$\int\tan\:\frac{x}{5}\:dx$
$\frac{dy}{dx}=\frac{1}{x}-\frac{y}{x\cdot\ln\left(x\right)}$
$cos\left(2arctan\left(-2\right)\right)$
$t=\left(a+b\right)^2+\left(a-c\right)^2+\left(b-c\right)^2$
$10+4\left(5-8\right)$
$\left(7-6x\right)\left(4+8x\right)$
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