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換元法 設t=sin a; 方程變為:t^2-(根號3+1)/2*t+根號3/4 =0; 十字相乘法:(t-1/2)(t-根號3/2)=0; 解出:t=1/2或t=根號3/2; 即:sin a=1/2或根號3/2; 所以a=30°或60°
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