$\cos^2x+\cos x=1-\cos^2x$
$27x^6-64y^{12}$
$\frac{2}{3}x+4\le6$
$-7+x=x-7$
$\int\left(\frac{1+u+u^2}{\sqrt{u}}\right)du$
$\frac{d}{dx}\left(\left(323x\right)^{2x}\right)$
$\lim_{x\to-1}\left(\frac{\sqrt{2x+3}-1}{x^5+1}\right)$
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