$( 5 a ^ { 2 } - 7 b ^ { 2 } ) ^ { 2 }$
$9x^2+9x+1=0$
$-5,3b^2x-20,6b^2x$
$series\:6x^3\cdot e^{\left(5x\right)}$
$\left(-6\right)\left(5\right)\left(-3\right)\left(-8\right)$
$x ^ { 3 } - 2 x ^ { 2 } - 15 x$
$\left(\sqrt{a}-\sqrt{x}\right)\left(\sqrt{a}-\sqrt{x}\right)$
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