$\cos=50$
$1+\frac{1}{cot^2}$
$36x^2+96xy+64x^2$
$-9+3x^2-y^2-\left(6+6x^2-3y^2\right)-4$
$\frac{2z^3}{x^{10}y^7z^5}$
$-21\left(-10\right)$
$\left(5x^5+y-m^3\right)^3$
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