$\:\left(5x-\sqrt{7}y\right)^2$
$15\:\left(3y\:-\:2\right)\:-\:10y$
$x^ay^b\cdot6x^2y$
$\left(2a^{-1}+3a^2\right)^2$
$-3z^2-6z^2$
$2\left(x+3\right)-4=2\left(x-5\right)$
$121+198\cos^6x+81\cos^{12}x$
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