question_answer

If \[\mathbf{co}{{\mathbf{t}}^{\mathbf{4}}}\theta \text{ }\mathbf{-}\text{ }\mathbf{co}{{\mathbf{t}}^{\mathbf{2}}}\theta \mathbf{=1}\], then the value of \[\mathbf{co}{{\mathbf{s}}^{\mathbf{4}}}\theta \text{ }+\text{ }\mathbf{co}{{\mathbf{s}}^{\mathbf{2}}}\theta \] is _________

A) \[-\]1                                                                

B)  1         

C)  0                                                        

D)  2

E)  None of these