$-\frac{3}{8}\left(-4y+z\right)$
$\frac{x^2+15}{\left(x+3\right)^2}$
$tan^22x=\frac{1}{3}$
$\frac{3+2x}{\left(x+1\right)^2+4}$
$\lim_{x\to0}\left(\frac{x^3-1}{x^2}\right)$
$\left(x+25-10\sqrt{x-1}\right)^2$
$\frac{a^{3\:}x^3+b^3}{ax-b}$
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