Choose the correct answer — task. Maths CBSE Mentoring, Class 10 Crash course.

If \(\cos α + \sin α = \sqrt{2} \cos α\), then \(\cos α - \sin α =\)

\(\sqrt{2} \sin α\)
\(2\cos α\)
\(2\sin α\)
\(\sqrt{2} \cos α\)

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