$11c+8+7c$
$16\cos^2x-12$
$\frac{dy}{dx}=\frac{e^ysin^2x}{ysecx}$
$-6x^2+5x-50$
$x^3-19x-30$
$z^2+2z-5=0$
$\left(\frac{1}{3}x-\frac{2}{5}\right)^2$
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