$\left(x-3\right)\left(x+3\right)\le0$
$\cos^2b\left(2+\tan^2a\right)$
$\left(3t+8u\right)\left(3t-8u\right)$
$\left(1+x^3\right)^{\frac{1}{3}}$
$436+228.576$
$\ln\left(\sqrt{a^2-4}\right)$
$cos^4x=\frac{1}{8}cos4x+\frac{1}{2}cos2x+\frac{3}{8}$
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