If cosθ + sinθ = $$\sqrt 2 $$ cosθ, then cosθ

Question

If cosθ + sinθ = $$\sqrt 2 $$ cosθ, then cosθ - sinθ is?

Options:

A . $$\sqrt 2 $$ tanθ

B . -$$\sqrt 2 $$ cosθ

C . -$$\sqrt 2 $$ sinθ

D . $$\sqrt 2 $$ sinθ

Answer: Option D

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