$sec^2a+sec^2a\:tan^2a$
$x^2+2x-9=0$
$-\frac{xy}{3}+\frac{5xy}{6}+\frac{9xy}{2}$
$\frac{3x}{10}+\frac{x+12}{8}>\frac{2x-2}{6}+11$
$\sqrt{45x^{15}}$
$\frac{23}{45}+\left(-\frac{23}{45}\right)$
$8x+7-3x=5x$
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