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In triangle ABC, range of (a^(2)+b^(2)+c...

In triangle ABC, range of `(a^(2)+b^(2)+c^(2))/(ab+bc+ca)` is (a,b,c are sides of triangle)

A

(1,2)

B

(1/2,1]

C

(1,2]

D

[1,3]

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The correct Answer is:
B
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