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Trigonometry
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in a triangle ABC, a,b,c be the length of the 3 sides,,and also a²+b²+c²=ab+bc+ca...then find the value of sin²A+sin²B+sin²C.................
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conclude \[(a-b)^2+(a-c)^2+(b-c)^2=0\]
which tells us triangle is equilateral
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