If cos2A + cos2B + cos2C = 1 then ABC is a (a) Right angle triangle (b) Equi

If cos2A + cos2B + cos2C = 1 then ABC is a

(a) Right angle triangle
(b) Equilateral triangle
(c) All the angles are acute
(d) None of these

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If cos2A + cos2B + cos2C = 1 then ABC is a (a) Right angle triangle (b) Equilateral triangle (c..

Answer / cryolife

If cos2A + cos2B + cos2C = 1 then ABC is a Right angle
triangle.

Ans is (a).

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