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JEE MATHEMATICS MCQ: PROPERTIES OF TRIANGLES

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Application +4 | -1
If A,B,CA, B, C are vertices of triangle, then cos⁡2A+cos⁡2B+cos⁡2C+2cos⁡Acos⁡Bcos⁡C\cos ^2 A+\cos ^2 B+\cos ^2 C+2 \cos A \cos B \cos C is equal to
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Correct option: A
1
Option A (1) is correct because by using trigonometric identities and the fact that A+B+C = pi, the expression simplifies to 1.

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