(1)
4sin²a-2(1+根号3)sina+根号3=0
∴ (2sina-√3)(2sina-1)=0
∴ sina=√3/2或sina=1/2
∴ a=60°或a=30°
(2)3tan²a-(3+根号3)tana+根号3=0
(tan-1)(3tana-√3)=0
∴ tana=1或tana=√3/3
即 a=45°或a=30°
(1)
4sin²a-2(1+根号3)sina+根号3=0
∴ (2sina-√3)(2sina-1)=0
∴ sina=√3/2或sina=1/2
∴ a=60°或a=30°
(2)3tan²a-(3+根号3)tana+根号3=0
(tan-1)(3tana-√3)=0
∴ tana=1或tana=√3/3
即 a=45°或a=30°