tan A+ tan B + tan C=tan A. tan B. tan C then (A) A,B,C must be angle of triangle. (B) A+B+C must be n integral multiple of π (C) the sum of any two of A,B,C is equal to third
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The answer is (A) . Because when the angles are in a triangle, we can assume that
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The rest you'll find in the attached picture(Forgive my bad handwriting)
The rest you'll find in the attached picture(Forgive my bad handwriting)
Attachments:
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