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If tan A and tan B are the roots of abx^...

If tan A and tan B are the roots of `abx^2- c^2x + ab= 0`, where a, b, c are the sides of the tnangle ABC, then the value of `sin^2 A + sin^2 B + sin^2 C` is :

A

1

B

3

C

4

D

2

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