[Answered] If [tex]\cos \theta+\sin \theta=\sqrt{2} \cos \theta[/tex], then [tex]\cos \theta-\sin \theta[/tex] is equal to a. [tex]$\sqrt{2}$[/tex] b. [tex]$\operatorname{Cos} \theta[/tex] c. [tex]$\sqrt{2} \sin \theta[/tex] d. [tex]$\sqrt{2} \cos \theta[/tex]