$cos\left(x+120^{\circ}\right)=sin\left(x+210^{\circ}\right)$
$\frac{d}{dx}8xe^{-x}$
$y^2+23y=-22$
$-7-5x=13-4x$
$7+x\le9$
$\int_1^{\infty}\left(\frac{x}{x+1}\right)dx$
$\left(\frac{2}{3}x^2-\frac{3}{4}y^2\right)^2$
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