Question

prove that:
cos (A + B+C) + cos (- A + B + C) + cos (A - B+C) + cos (A + B-C)/
sin (A + B + C) + sin (- A + B + C) + sin (A - B+C) - sin (A + B-C)
= cot C​

Answer 1

Answer:

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Step-by-step explanation:

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