$\sqrt{-75}$
$\frac{4-x}{1-x}=\frac{12}{3-x}$
$3\cdot0^2-8$
$\sqrt{2yz}+\sqrt{2yz}+yz+\frac{7}{3}yz$
$-3\left(2y-6\right)$
$\left(\csc\left(x\right)\right)^2-2\left(\csc\left(2x\right)\right)^2=2\cot\left(2x\right)\csc\left(2x\right)$
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