$\left(-x^2-y^2\right)^3$
$\left(9c+5\right)\left(9c-5\right)$
$\cos^3a+\sin^2a\cdot\cos a=\cos a$
$-8-\left(10\right)-\left(+2\right).5$
$\frac{x^2-7x-6}{x-4}$
$\left(2a+3\right)\left(4a^2+6a+9\right)$
$-2\cdot\left(-3\right)\cdot\left(-10\right)\cdot5$
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