$3x^3+17x^2+21x-9$
$x^2-9x-4$
$-18=\frac{x}{16}$
$\left[-2\left(-2\right)\right]:\left[2\left(-2\right)\right]4$
$\left(9a^3-2x^4\right)^2$
$\int^{\pi}\cos^2xdx$
$9x^2+30x+25=121$
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