$\lim_{x\to0}\left(\frac{\sqrt{2}-\sqrt{1-\cos\left(x\right)}}{\sin\left(2x\right)}\right)$

$4512e^{0.0225\left(15\right)}$

$\left(x+2\right)^2-3\left(x+1\right)$

$3f^2-27f$

$\frac{\cos\left(x\right)}{\sin\left(x\right)+\tan\left(x\right)}$

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

$20^{-2}\cdot20^2$