$19+14+6+12+13$
$49a^2-42a+9$
$\frac{\cos\left(90-x\right)\cos\left(x\right)}{\cot\left(x\right)}=1-\cos\left(x\right)$
$9x^2-36x+36y^2$
$\frac{\left(x^3+2x^2-1\right)}{x^2+x-6}$
$\frac{dy}{dx}\:=\:2x\:+\:1;\:y=\:3$
$\lim_{h\to0}\left(\frac{2^{x+h}-2^x}{h}\right)$
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