Categories > trigonometry > Fundamental trigonometrical ratios and functions > If $\cos \theta -\sin \theta =\sqrt{2}\sin \theta ,$then $\cos \theta +\sin \theta $is equal to

trigonometry

Question: If $\cos \theta -\sin \theta =\sqrt{2}\sin \theta ,$then $\cos \theta +\sin \theta $is equal to


1) $\sqrt{2}\cos \theta $
2) $\sqrt{2}\sin \theta $
3) $2\cos \theta $
4) $-\sqrt{2}\cos \theta $
Solution: Explanation: No Solution
Fundamental trigonometrical ratios and functions Trigonometrical ratio of allied angles

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