$-5-9-\left(-6\right)+\left(-2\right)+12$
$cos^{\left(2\right)}\theta\:+2cos\theta\:+1=0$
$\frac{2}{\left(x+2\right)^2}$
$\left(-12+26\right)-\left(-4+-9\right)$
$\frac{d}{dx}\frac{x^2}{3x-2}$
$x^42x^3$
$2x-\sqrt{\left(-8x^3+30\right)}$
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