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A, b, c are the lengths of three sides of a triangle ABC. If a, b, c are related by the relation a2 + b2 + c2 = ab + bc + ca, then the value of (sin2A + sin2B + sin2C) is?
Options:
A .  $$\frac{3}{4}$$
B .  $$\frac{3}{2}$$
C .  $$\frac{{3\sqrt 3 }}{2}$$
D .  $$\frac{9}{4}$$
Answer: Option D
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