$1-\sin^4x+2\cos^2x$
$\frac{\tan\left(x\right)+1}{\cot\left(x\right)+1}+\cot\left(x\right)=2\csc\left(2x\right)$
$x^2+7x+10\le0$
$2y+2xy'=7$
$\left(3x-5y+7z\right)\left(2x-3y\right)$
$\:\int\:\int\:\frac{3x+2}{x^3+3x^2+3x+1}dx$
$\lim_{x,y\to0,ln2}\left(e^{x-y}\right)$
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