$9x^2-15+64$
$29+24+8p-34$
$-x^2-4x-2=0$
$\lim_{x\to0}\left(\frac{16\cdot sen^2\left(\frac{x\pi}{8}\right)}{\left(x\pi\right)^2}\right)$
$100x^2-160x+64$
$t^2-1.4t+.49$
$-\frac{20mn^2}{5mn}$
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