$a^2=b^2+c^2-2bc\cos\left(a\right)$
$18x^2=65x-7$
$3ab\left(3a-b\right)$
$\sin^2a+1=2-\cos^2a$
$246+\left(172+54\right)$
$\frac{-60m^3n}{5m^5n^{-2}}$
$5x\left(x+2\right)^2\left(\left(x+2\right)-5x^3+3x\left(x+2\right)^2\right)$
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