$\sin\left(3\cdot\frac{\pi}{6}\right)$
$\frac{x-1}{x}-2=\frac{-x-1}{x^2-2x}$
$81^4-18x^2+1$
$-2x+5=7$
$\sin\left(\cot\left(\sqrt{\left(\frac{1-x}{1+x}\right)}\right)^{-1}\right)^2$
$\left(40\right)-\left(-30\right)$
$2\left(8n+2\right)+8n$
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