Inverse Trigonometric Functions

$-\frac{\left|\operatorname{cosec} \frac{x}{2}\right|}{2 \sqrt{\sin ^2 \frac{x}{2}-\cos ^2 \frac{x}{2}}}$

$\frac{\left|\sec \frac{x}{2}\right|}{2 \sqrt{\cos x}}$

$\frac{\cos \frac{x}{2}}{2 \sqrt{\cos x}}$

$\frac{\cos \frac{x}{2}}{\sqrt{\cos x}}$