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" If "cos theta-sin theta=sqrt(2)sin the...

" If "cos theta-sin theta=sqrt(2)sin theta," then prove that "cos theta+sin theta=sqrt(2)cos theta

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If cos theta+sin theta=sqrt(2)cos theta then prove that cos theta-sin theta=sqrt(2)sin theta

If cos theta+sin theta=sqrt(2)cos theta, then prove that cos theta-sin theta=sqrt(2)sin theta

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