$\lim_{x\to0}\left(\frac{3\tan\left(x\right)}{x\sec\left(x\right)}\right)$
$25x^4-49$
$\int_{-2}^2\left(x+x^3\right)dx$
$12a-8-12$
$x^3+3x^2+3x^2-1$
$\left(5x-4y+2z\right)^2$
$\frac{-1-x^2}{\left(1+x^2\right)^2}=0$
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