$5x^4y+3x^2y-9xz-15x^3z$
$\left(x^3y^3-6\right).\left(x^3y^3+8\right)$
$4+-13+-1+-8$
$\lim_{x\to2}\:x^3-2x^2+3x-1$
$\frac{\left(2x^2y^3\right)^4}{\left(4xy^2\right)^2}$
$2x-14$
$si\:sen\:x=\frac{5}{13};csc\:x$
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