$9a^{2}-4a^{2}b^{2}$
$\frac{x^2+7}{x^2-5x+6}$
$\frac{8a^2-4ab^2+12ab}{a+b}$
$y=\frac{ln\sqrt{x}}{\sin^3\sqrt{x}}$
$4cos^2x+cosx-5$
$\left|+3+4\right|-\left(-1\right)$
$4x^2\:-\:8x\:+\:4$
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