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(cosθ+sinθ)2+(cosθ−sinθ)2=?\large \left( \cos{ \theta +\sin { \theta } } \right) ^{ 2 }+\left( \cos{ \theta -\sin { \theta } } \right) ^{ 2 }=? (cosθ+sinθ)2+(cosθ−sinθ)2=?
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