$-\left(-8\right)-\left(-8\right)-\left(-8\right)-\left(-8\right)-\left(-8\right)$
$8^2:\:2^2$
$-\frac{2}{5}bx^2+\frac{1}{5}bx^2+\frac{3}{4}bx^2$
$1=sen^2\left(b\right)+0.554^2$
$\cos^2\left(\frac{3\pi}{11}\right)-\sin^2\left(\frac{3\pi}{11}\right)$
$\sqrt{a}^2-u^2$
$12x^2-18xy$
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