The value of ( + + + - - ) is?

Answer: Option D

$$\begin{array}{rl}& \left(\frac{\sin \theta +\sin \varphi }{\cos \theta +\cos \varphi }+\frac{\cos \theta \cos \varphi }{\sin \theta -\sin \varphi }\right)\\ & \text{Put }\theta =90^{\circ }\\ & \varphi =0^{\circ }\\ & \therefore \left(\frac{\sin 90^{\circ }+\sin 0^{\circ }}{\cos 90^{\circ }+\cos 0^{\circ }}+\frac{\cos 90^{\circ }-\cos 0^{\circ }}{\sin 90^{\circ }-\sin 0^{\circ }}\right)\\ & \Rightarrow \left(\frac{1+0}{0+1}+\frac{0-1}{1-0}\right)\\ & \Rightarrow \left(1-1\right)\\ & \Rightarrow 0\end{array}$$