$2m-\left(m-n\right)-\left(m+n\right)$
$\frac{4}{5}x>1$
$x^3-2x^2-9x+18$
$\left(1+\sin\left(y\right)\right)\left(1-\sin\left(y\right)\right)=\frac{1}{\sec^2}$
$\sin\left(4x\right)\cos\left(6x\right)$
$\left(3a+3\right)\left(2a-3\right)$
$\left(x^3+2x^2-x\right)\left(x^2-2x+5\right)$
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