$\frac{\left(n^3\cdot\:x^n\right)}{9^n}$
$\lim_{x\to\infty}\left(1+\frac{2}{3x}\right)^{7x}$
$1000y^9-m^{15}$
$\left(cscx-1\right)\left(cscx+1\right)=-cot^2x$
$25-\left(-12\right)-9$
$x\frac{dy}{dx}+3y=x^2-1$
$a=\frac{sen\left(-x\right)+\cos\left(-x\right)}{sen\:x+\cos x}$
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