$\frac{dy}{dx}=40-0.08x$
$\sqrt{1.41421356237+\sqrt{5-3\cdot2.44948974278-1\cdot\sqrt{2}+\sqrt{8+2\sqrt{12}}}}$
$2c+7c+1+c^2$
$20a^2+23a-21$
$5x^2+10x+2x+45$
$\lim_{x\to0}\left(\frac{\cos\left(4x\right)}{tan\left(3x\right)}\right)$
$\frac{\left(a-2\right)}{4}+5+\frac{a}{2}=15$
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