$\:cos\:2\:x\:+\:2\:=\:\:sin\:x\:\:$
$1-81x^2$
$\frac{dy}{dx}=7$
$\lim_{x\to1}\frac{e^{x-1}-1}{x-2}$
$x^2+bx+\frac{b}{2}^2$
$1+-27$
$\int\frac{sinx}{cosx-cos^2x}dx$
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