$\frac{\cos\left(x\right)}{1+\cos\left(2x\right)}=\frac{1}{2\cos\left(x\right)}$
$f\left(x\right)=\left(x^2+4x-5\right)^2$
$y\left(2x-y\right)\cdot3-\left(2a-3\right)$
$-27^{\frac{1}{2}}$
$\sqrt[3]{b^3}$
$\left(w+3\right)\left(w-3\right)$
$\:\left(-2x^2+6xy+y^2\right)+\left(3x^2-8xy-3xz\right)$
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