求证: sina+sinb=2sin[(a+b)/2]cos[(a-b)/2] cosa+cosb=2cos[(a+b)/2]cos[(a-b)/2]
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![求证: sina+sinb=2sin[(a+b)/2]cos[(a-b)/2] cosa+cosb=2cos[(a+b)/2]cos[(a-b)/2]](/uploads/image/z/1801979-35-9.jpg?t=%E6%B1%82%E8%AF%81%EF%BC%9A+sina%2Bsinb%3D2sin%5B%28a%2Bb%29%2F2%5Dcos%5B%28a-b%29%2F2%5D+cosa%2Bcosb%3D2cos%5B%28a%2Bb%29%2F2%5Dcos%5B%28a-b%29%2F2%5D)
求证: sina+sinb=2sin[(a+b)/2]cos[(a-b)/2] cosa+cosb=2cos[(a+b)/2]cos[(a-b)/2]
求证: sina+sinb=2sin[(a+b)/2]cos[(a-b)/2] cosa+cosb=2cos[(a+b)/2]cos[(a-b)/2]
求证: sina+sinb=2sin[(a+b)/2]cos[(a-b)/2] cosa+cosb=2cos[(a+b)/2]cos[(a-b)/2]
这个是和差化积公式?