question_answer

If \[\mathbf{A=}\frac{\mathbf{1}}{\mathbf{1+sin }\theta }\mathbf{+}\frac{\mathbf{1}}{\mathbf{1-sin }\theta }\], then A equals to _________ .

A) \[{{\sec }^{2}}\theta \]                                    

B)  \[2{{\sec }^{2}}\theta \]

C)  \[{{\cos }^{2}}\theta \]                                               

D)  \[2{{\cos }^{2}}\theta \]

E)  None of these