$\frac{\sqrt[3]{x^2}\left(x^2+1\right)^3}{\left(2x+1\right)^5}$

$sin30^{\circ}cos45^{\circ}+cos30^{\circ}sin45^{\circ}$

$\lim_{x\to\infty}\left(\frac{3x+1}{3x-1}\right)^{x+1}$

$\left(7x^3+2x^2-11x\right)+\left(-3x^3-2x^2+4x-3\right)$

$\frac{45}{\left(-5\right)}$

$-4\cdot\frac{9}{-1}$

$\lim_{x\to\frac{\pi}{2}}\left(\frac{\cos\left(x\right)}{x^2}\right)$