$\frac{cosx}{1-sinx}+\frac{sinx}{cosx}$
$\frac{x^3-3x^2+6x+1}{3x+21}$
$\int\left(x^8\sin\left(x\right)\right)dx$
$\left(-3\right)\cdot\left|-\left(+4\right)+\left(-7\right)-\left(-6+5-2\right)\right|$
$\left(20\right)\left(-1\right)\left(-30\right)$
$4x+7=23$
$\sqrt{\sqrt[3]{8x^7}}$
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