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If tan^2 A+ tan^2 B+tan^2 C-tan B tan C ...

If `tan^2 A+ tan^2 B+tan^2 C-tan B tan C -tan C tan A-tan A tan B=0` then `DeltaABC` is (i) Isosceles (ii) Right Angled (iii) Equilateral (iv) Right angled isosceles

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