$\lim_{x\to\pi4}\left(\tan\left(x\right)+\sin\left(x\right)\right)$
$\:30+2t\:$
$\frac{3x^2}{4x^2y^3}$
$-\frac{1}{2}x^2y^2+x^3-2x^3+\frac{2}{5}xy$
$\lim_{t\to0}\left(\frac{6+4t}{t^{2}+1}\right)$
$-6a^3b^2c\:\:si\:a\:=-2\:b=3\:d=-4$
$2x\:-\:5\:<\:7x\:-\:3$
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