$\frac{\sqrt{x}-\sqrt{a}}{ax\sqrt[5]{x^3}}$
$8x-2y$
$1-\csc^2a=-\cot^2a$
$\left(3a+5y\right)^2$
$\:\left(1-\frac{2}{n}\right)^n$
$x^2-6^2+9$
$\frac{c}{c}$
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