$27-24x+4x^2$
$-3\:+\:\left(-5\:+\:4\right)\:-\:\left(-8\:+\:3\:+\:9\right)$
$\left(w^2-7wv+u^2+v^2\right)\left(7wv+v^2+w^2+u^2\right)$
$\frac{1+cosx}{cosx}$
$y^4+9y^2+25$
$\lim_{x\to\infty}\left(\frac{\sqrt{1-x^2}-1}{x}\right)$
$x3^2$
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