question_answer

Value of the expression \[\left( \text{1}-\text{cos}\theta  \right)\left( \text{1}+\text{cos}\theta  \right)\left( \text{1}+\text{co}{{\text{t}}^{\text{2}}}\theta  \right)\]is

A)  0                            

B)         1  

C)  \[{{\sin }^{2}}\theta \] 

D)         \[\cos e{{c}^{2}}\theta \]