$\frac{\cos\left(a\right)^2}{1+\sin\left(a\right)^2}=1$
$-6\left(3x-5x^2\right)$
$\left(m^5\cdot n^3\right)^{\frac{1}{2}}$
$4m^2+12m$
$-9\:r\:-51$
$\int\frac{2x}{\sqrt{x^2-6x+45}}dx$
$5x+6>3x-12$
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