$y^2=x^2-cx$
$\left(5w+x^{2}y\right)^{7}$
$\ln\sqrt{15x^5y^7}$
$-12\left(x-y\right)$
$\frac{\sec\theta}{1+\sec\theta}=\frac{1-\cos\theta}{\sin^2\theta}$
$x^2-4>6$
$\sqrt{2+3}\sqrt{5-4}\sqrt{2}$
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