$cos^2x\:+\:2\:cos\:x\:+\:1\:=\:0$
$\frac{dy}{dx}\cdot\sqrt{x^2-9}=5x$
$\int_0^{\infty}\left(\frac{32tan^{-1}\left(4x\right)}{1+16x^2}\right)dx$
$2\sin^2x+2-7\cos x$
$\frac{2x-3}{2}+\frac{5-2x}{6}\ge\frac{x}{4}$
$\frac{1-81y^4}{1-3y}$
$-6,94-39.18$
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