$\lim_{x\to-1}\:3x^3-2x^2+5x+7$
$\frac{\sqrt{\infty}}{50}$
$3+\left(2^3+1\right)-2$
$16x^2-121y^2$
$\left(4x^4y^{-3}\right)\:\left(8x^{-1}y^{-3}\right)$
$\tan^2\left(x\right)\sec\left(x\right)+sec\left(x\right)=sec^3x$
$\left(2abc\right)\left(-2ab\right)$
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