$\frac{1+\cos\left(a\right)}{\sin\left(a\right)}+\frac{\sin\left(a\right)}{1+\cos\left(a\right)}=\frac{2}{\sin\left(a\right)}$
$\left(5x+2\right)^2-\:\left(5x-2y\right)^2$
$x^2-18x+66$
$\frac{6x-7}{4}\ge-5$
$16g+10-4g$
$\frac{x^2+6x+3}{x+1}$
$25x^2+200x+400$
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