已知sinA+sinB=sin225°,cosA+cosB=cos225° 求cos(A-B)及cos(A+B)的值
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![已知sinA+sinB=sin225°,cosA+cosB=cos225° 求cos(A-B)及cos(A+B)的值](/uploads/image/z/10785822-6-2.jpg?t=%E5%B7%B2%E7%9F%A5sinA%2BsinB%3Dsin225%C2%B0%2CcosA%2BcosB%3Dcos225%C2%B0+%E6%B1%82cos%28A-B%EF%BC%89%E5%8F%8Acos%28A%2BB%29%E7%9A%84%E5%80%BC)
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