$\left(\frac{3}{5}x\right)^2-\left(\frac{1}{2}\right)\left(\frac{3}{5}x\right)^2+\left(\frac{1}{2}\right)$
$12x^2+9xy$
$\left(2s+t\right)-3\left(s-6\right)+4\left(l-t\right)$
$\frac{1}{2cos^2x-1}$
$\:\left(3x\right)\:\left(-2y\right)$
$+565-464-563$
$\frac{x+5}{x+8}=\frac{3}{x}\:$
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