$\frac{1}{3}x=\frac{2}{15}x+\frac{1}{5}$
$\left(\left(x-82-3z\right)\right)-\left(3x+3y-2z\right)$
$\int-3x\sqrt{4+x^2}dx$
$cos^2\theta\:\cdot\:\:sec^2\theta\:\:+cos^2\theta\:\cdot\:\:csc^2\theta\:=csc^2\theta\:$
$7\le12.1-f$
$x^2-20x+100=0$
$5abc\left(3a^2bc^2-2\right)$
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