$2x-2-\frac{4}{x}=0$
$\cos^2\left(x\right)=\sin^2\left(\frac{x}{2}\right)$
$35-\:\left(-12\right)\:$
$\left(7a+2\right)\left(7ax-6\right)$
$x^2+7x=0$
$\log_{10}\left(\frac{6}{z}\right)$
$f\left(x\right)=\sqrt[2]{x^2}+1$
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