$\cos\left(x\right)=\frac{8}{5}$
$4+ln\left(x-4\right)=8$
$\frac{x^6}{x^3}$
$\sqrt{\left(\frac{1-x^2}{x^2}\right)}$
$\cos\left(x+y\right)\sin\left(y\right)-\sin\left(x+y\right)\cos\left(y\right)$
$\int\frac{x-1}{\left(2x-1\right)\left(x-2\right)}dx$
$\int\frac{-x}{1+x^2}dx$
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