$\frac{x^3}{x^2+x-2}$
$10x+4+28x^2$
$\tan^2\left(x\right)-\sin^2\left(x\right)=\tan^2\left(x\right)\cdot\sin^2\left(2\right)$
$1\cdot7+\left(-3\right)$
$20\:\cdot\:-5$
$-z^2+3z-2>0$
$\left(y^2+5\right)\left(7y+4\right)$
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