$\left(x+1\right)\left(x+h-1\right)$
$\infty-\infty-1$
$\ln\left(2x^4+x^3+3x^2+3x\right)$
$\lim_{x\to0}\left(\frac{3tg\left(x\right)-3x}{x^3}\right)$
$-3\left(x-y\right)+4\left(3x-2y\right)$
$4cosx\:sen\:y\:=\:1$
$\frac{sen\:a\:}{1+cos\:a\:}$
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