$z=senx\cdot cosy,\:x=\sqrt{t},\:y=\frac{1}{t}$
$x+\frac{1}{x}=\sqrt{7}$
$\frac{7x+3}{x^{2}+3x-4}$
$36f^8-64z^6$
$\left(9y\:-\:3\right)\:\left(9y\:+\:3\right)$
$\int x^{11}\ln\left(x\right)dx$
$\int\frac{x}{\left(x+3\right)\left(x-1\right)}dx$
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