$sin^{-1}\left(\sin\left(\frac{11\pi}{9}\right)\right)$
$\frac{1-\sin\left(a\right)^2}{\cos\left(a\right)^2}=\frac{1-\sin\left(a\right)}{1+\sin\left(a\right)}$
$\left(s-2\right)^2$
$x^2-225=0$
$\int\frac{cos\left(x\right)}{2sin\left(x\right)+4}dx$
$a^x\left(a^{x+1}-b^{x+2}\right)\left(a^{x-1}-b^{x+2}\right)$
$-\frac{2}{3}\:xy^3z^2+\frac{1}{9}x^3y^2z$
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