Teaching OSSSC TGT Teachers Mock Test Series 2025 Mathematics Trigonometry Trigonometric Functions

If tanA + tan B + tan C = tan A. tan B. tan C, then 

1
A, B, C must be angles of a triangle
2
The sum of any two of A, B, C is qual to the third 
3
A + B + C must be an integral multiple of π
4
none of these
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