$9a^2-27ab+9b$
$p\left(x\right)=4x^3-5^2+x-2$
$\cos2a\:-\:cos\:6a$
$-\left(-3\right)+\left\{\left(-5\right)\:-\:\left[\left(+8\right)\:+\left(-10\right)\right]\right\}$
$\int_{\frac{\pi}{4}}^{\frac{3\pi}{2}}\left(x^2\sin\left(x\right)\right)dx$
$530\:+\:-872$
$r^2-20r-21=5$
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