$\frac{b^{2\:}-9b-7}{b^2}$
$\frac{1}{3}\left(9z+12\right)$
$\arcsin\left(2-1\right)$
$-10\::\:-12$
$\sqrt{x^2-2x^2}$
$5a^2+\frac{3}{4}b^2-cd^2+\frac{7}{5}a^4b^5\:;\:a=2,\:b=1,\:c=-2,\:d=4$
$a^6+a$
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