$3\cos2x-5\cos x=1$
$\int\frac{x^3+x+3}{x^2+2x+1}dx$
$\frac{d}{dx}y=-0.5$
$\left(x+a\right)\:^2$
$16x^2+40xy^2+25y^4$
$\frac{dx}{dy}-1-2x\tan\left(y\right)=0$
$\frac{d^2}{dx^2}\left(\frac{4x^3}{3}-7x\right)$
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