+ - is equal to-

Answer: Option B

$$\begin{array}{rl}& \sqrt{\frac{\cot \theta +\cos \theta }{\cot \theta -\cos \theta }}\\ & =\sqrt{\frac{\cos \theta \left(\frac{1}{\sin \theta }+1\right)}{\cos \theta \left(\frac{1}{\sin \theta }-1\right)}}\\ & =\sqrt{\frac{1+\sin \theta }{1-\sin \theta }}\\ & =\sqrt{\frac{{\left(1+\sin \theta \right)}^2}{1-{\sin }^2\theta }}\\ & =\frac{1+\sin \theta }{\cos \theta }\\ & =\sec \theta +\tan \theta \end{array}$$