$x^2-10x+19=0$
$19-2\left(4.5-11\right)$
$4x^2-2y=6$
$\log x+\log\left(x-15\right)=2$
$\lim_{x\to0}\cos\left(x\right)^{\frac{5}{x^2}}$
$\sqrt[4]{a^2}b\cdot\sqrt{b^2}c$
$\tan^240$
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