prove that
![\sin(105) + \cos(105) = \cos(45 ) \sin(105) + \cos(105) = \cos(45 )](https://tex.z-dn.net/?f=+%5Csin%28105%29++%2B++%5Ccos%28105%29++%3D++%5Ccos%2845+%29+)
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ok solve your question
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