$-15-\left(-12+\left(-9+15-20\right)-3\right)+29$
$cscx=\frac{1+secx}{sinx+tanx}$
$-x^3+9x^2-27x+27$
$-390-654$
$4x^2y^2+12xy^3+9y^4$
$\left(z^8\right)^8$
$\lim_{x\to\infty}\left(\frac{20x}{20x+2}\right)^{3x}$
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