$\frac{c}{1}$
$senx^2\frac{x}{y}$
$\:\left[2\:-\:\left(-8\right)\:+\:5\:-\:4\right]\:+\:\left(-12\right)$
$4w^2+36wy+81y^2$
$\frac{12\sin^2+11\sin+2}{3\sin^2+5\sin+2}$
$\lim_{x\to+\infty}\left[sen\left(\sqrt{4+x^2}\right)-sen\left(x\right)\right]$
$4\log\left(5x\right)-\log\left(5x^2\right)=3$
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