$\left(100-30\right):\left(-4-3\right)$
$-5-8y<11$
$3\cot\left(x\right)=9$
$\frac{d^2}{dx^2}\left(a\cdot b\right)$
$3y^6y+7x^7y+2x^7y^5$
$3x^2-10x+3$
$\int_{-1}^1x^3\:sin\left(\frac{nx}{2}\right)\:dx$
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