$\int\frac{x^2}{z^2-x^2}dx$
$3+\left(-2\right)-\left(-4\right)-\left(+1\right)$
$-3x^2+5x+2$
$\left(-80\left(-20\right)\right)$
$\left(4y\:-\:10\right)\:-\:\left(6y\:+\:8\right)$
$1-x^2+3x^2-3x=0$
$\tan^4z-\sec^2z$
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