AAI ATC Junior Executive 21 Feb 2023 Shift 1 Paper

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Question : 74 of 120

Marks: +1, -0

If A, B and C are angles of a triangle, then which of the following is correct?

sin 2A + sin 2B - sin 2C = 4 cos A sin B cos C
cot A cot B + cot B cot C + cot C cot A = -1
$\tan ⁡\;{A}/{2}\tan ⁡\;{B}/{2} + 1 = \tan ⁡\;{B}/{2}\tan ⁡\;{C}/{2} + \tan ⁡\;{C}/{2}\tan ⁡\;{A}/{2}$
tan A + tan B + tan C = tan A tan B tan C

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