$a3-5a+1\:entre\:a+2$
$\sin\left(x\right)+sin\left(y\right)=2+\frac{4}{\csc\left(x\right)}$
$-\int\frac{x^5}{x^4-1}dx$
$\left(2x\:+\:\frac{1}{2}y\right)^2\:$
$x^4-2^3-x^2+1$
$x\:+\:10\:=\:2\:\left(\:y\:+\:10\:\right)$
$-1b^2\:-\:2b^2$
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