$\frac{d}{dx}\sqrt{-x}$
$\left(2x+3y=2\right)^2$
$\lim_{x\to0}\left(\frac{e^{2x}-1-x}{x^2}\right)$
$\cos^2\left(x\right)\left(1-\tan^2\left(x\right)\right)=\cos^2\left(x\right)\sec^2\left(x\right)$
$5y^4+25y^3-70y^2$
$x^2+0.6x+0.09<0$
$y'-xy=1-x$
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