$\lim_{n\to\infty}\left(\frac{\left(-n+1\right)}{n}\right)$
$\left(x-y\right)^2\frac{dy}{dx}=4$
$sec\left(x\right)csc\left(x\right)-\frac{sin\left(x\right)}{cos\left(x\right)}=cos\left(x\right)$
$-i-i$
$a^2+2a^2$
$\frac{2x^2+3x+1}{x-1}$
$5x\:-2\:por\:x=1$
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