$2\cos2x-\cos\left(x\right)-1=0$
$f\left(x\right)=2\left(5x^3-10x^2+15x\right)^3$
$\sqrt[4]{\frac{x-1}{x+1}}$
$\left(a+b\right)^2\:-\:\left(a+b\right)\left(a-b\right)$
$\left(f+4\right)^3$
$\left(-9+4\right).-5$
$\frac{2}{\sin\left(3\right)}$
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