$\sen^{2}\left(-\theta\right)-\cos^{2}\left(-\theta\right)=1$
$\sqrt[3]{\frac{27t^9}{729}}$
$a-3b\:=\:-3b-a$
$36x^{2}-108x^{4}+81$
$-7b-1b+5b+b$
$m^2\:+\:4m\:=\:27$
$-8\sqrt{3}+8i$
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