$\frac{\csc a}{\sin a}-1=\cot^2\left(a\right)$
$16^1$
$2x^3-6-11x-3x^2$
$10+a+3$
$\left(3n-5y\right)^4$
$\frac{x^4+3x^3+5x^5-1}{x+x^3-2}$
$x^3+y^3=4$
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