$\tan\left(x\right)^2\left(\sin\left(x\right)+\cos\left(x\right)\right)$
$x\:+\:4\:=\:12$
$\lim_{x\to0}\left(\frac{\ln\left(2x+1\right)\sin\left(2x\right)}{x^2}\right)$
$\left(5\right)^2+\left(7\right)^2\left(9\right)-4$
$-3x+\frac{7}{3}\le x+5$
$\left(2w+9x+z\right)^{2}$
$\frac{x^2}{\left(x^2+x+2\right)}$
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