$5\cos^2\left(x\right)+10=15\cos\left(x\right)$
$30x^2+13x+10$
$\left(-\frac{\sqrt{3}}{5}+10.8\right)$
$\frac{12a^{3}x^{4}+2a^{2}x^{3}}{18ab^{2}x+3b^{2}x^{2}}$
$\left(b^{-6}\right)^{-8}$
$\left(y+9\right)\left(9-y\right)$
$\frac{a^2+2a-3}{a+4}$
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