$\frac{x^3-25x}{x^2+5x}$
$2\cdot3^3+10$
$4x^2+10x+6=0$
$\sin^5x-\sin\left(x\right)\cos^4x$
$9cos^2x=-10cosx-1$
$\left(\frac{2}{9}-2x\right)^2$
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