$\frac{1+\sin x}{\cos x}=$ কত ?

$\sin \left(\frac{\pi}{4}+\frac{x}{2}\right)$

$\tan \left(\frac{\pi}{4}+\frac{x}{2}\right)$

$\cot \left(\frac{\pi}{2}+\frac{x}{2}\right)$

$\cos \left(\frac{\pi}{2}+\frac{x}{2}\right)$