$5m^4\cdot3m^{-1}$
$f\left(x\right)=\left(\frac{\sec x-3x^2}{\cot+x+x}\right)^2$
$\lim_{x\to-\infty}\left(\frac{e^{-x}}{x^2}\right)$
$x=cosy$
$\frac{\left(x^3-y^2\right)^3}{4\sqrt{y^2-13}};\:x=2;\:y=7$
$\sqrt{x^2y^2}$
$4^2+12^1$
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