$\frac{1}{\tan\left(x\right)}+\frac{\sin\left(x\right)}{1+\cos\left(x\right)}=\frac{1}{\sin\left(x\right)}$
$x^3-12x^2+47x-60$
$8\cdot\left(9-7\right)$
$x^2-11x=1$
$\frac{\left(0.1j\cdot0.1j\right)}{0.2j}$
$\left(z^3-w^4\right)\left(z^3+w^4\right)$
$-2-5x=o$
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