In a $A B C, if ∣ ∣ 1111 + cos A 1 + cos B 1 + cos C cos^{2} A + cos B cos^{2} A + cos B cos^{2} + cos C ∣ ∣ = 0$ show that $A B C$ is an isosceles.

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In a

A B C, if ∣ ∣ 1111 + cos A 1 + cos B 1 + cos C cos^{2} A + cos B cos^{2} A + cos B cos^{2} + cos C ∣ ∣ = 0

show that

A B C

is an isosceles.

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Question Text

In a

A B C, if ∣ ∣ 1111 + cos A 1 + cos B 1 + cos C cos^{2} A + cos B cos^{2} A + cos B cos^{2} + cos C ∣ ∣ = 0

show that

A B C

is an isosceles.

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