若△ABC满足cos²A+cos²B=3cos²C-1,求C的取值范围 急
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/30 19:14:39
![若△ABC满足cos²A+cos²B=3cos²C-1,求C的取值范围 急](/uploads/image/z/7174641-57-1.jpg?t=%E8%8B%A5%E2%96%B3ABC%E6%BB%A1%E8%B6%B3cos%26%23178%3BA%2Bcos%26%23178%3BB%3D3cos%26%23178%3BC-1%2C%E6%B1%82C%E7%9A%84%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4+%E6%80%A5)
若△ABC满足cos²A+cos²B=3cos²C-1,求C的取值范围 急
若△ABC满足cos²A+cos²B=3cos²C-1,求C的取值范围 急
若△ABC满足cos²A+cos²B=3cos²C-1,求C的取值范围 急
sinA*sinA+sinB*sinB=2sinC*sinC;a*a+b*b=2c*c=2(a*a+b*b-2a*bcosA),cosA>1/2,A<60