Find the limit $\lim_{x\to0}\left(\frac{x^2}{1-\cos\left(x\right)}\right)$

$\frac{7\sin\left(62\right)}{\sin\left(62\right)}$

$\sec\left(2+\csc\left(2\right)\right)$

$\frac{1}{\cos\left(x\right)}-\frac{\cos\left(x\right)}{1+\sin\left(x\right)}$

$\left(\left(\left(-13^2\left(-13^9\right)^4\right)^{\frac{1}{5}}\right)^{\frac{1}{2}}\right)^{\frac{1}{3}}$

$\frac{1}{4}\cdot\cot\left(7x\right)$

$\tan\left(x\right)+\cot\left(x\right)$

$\left(\left(\left(2^2\right)^2\right)^2\right)^0$