$\left(2+3x^4-x\:^3\right):\:\left(x-3\right)$
$y=10\left(t+\frac{1}{t}\right)^9\left(1-\frac{1}{t^2}\right)$
$7\:cot\left(\frac{\pi}{2}-x\right)cos\left(x\right)$
$\left(x+20\right)\left(x-3.1\right)$
$\frac{dy}{dx}=4x^3+3x^2+2$
$\left(-6\right)\cdot\left(-2\right)\cdot7$
$3\left(8\right)+1$
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