Answer: 3.
- A 2
- B 3
- C 4
- D 6
Correct answer: B. 3
Explanation: In a triangle tanA + tanB + tanC = tanA·tanB·tanC. So 6 = 2·tanC, giving tanC = 3.
Unit circle with standard angles 0, 30, 45, 60, 90 degrees; at 45 degrees the point is (cos45, sin45) = (1/sqrt2, 1/sqrt2).
Concept context
Ratios, identities, and applications in triangles