यदि \( \cos \theta-\sin \theta=\sqrt{2} \sin \theta \), तो सिद्ध कीजिए कि-
\[
\cos \theta+\sin \...
यदि \( \cos \theta-\sin \theta=\sqrt{2} \sin \theta \), तो सिद्ध कीजिए कि-
\[
\cos \theta+\sin \theta=\sqrt{2} \cos \theta
\]
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