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If tantheta = (sinalpha-cosalpha)/(sinal...

If `tantheta = (sinalpha-cosalpha)/(sinalpha+cosalpha),` then (A) `sin alpha-cos alpha=+-sqrt(2) sin theta` (B) `sinalpha+cosalpha=+-sqrt(2) cos theta` (C) `cos2theta=sin2alpha` (D) `sin2theta+cos2alpha=0`

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