Use the identity for tan(A+B) or tan(A-B) to solve each problem {1-6}
1) tan75° = tan(30° + 45°)
2) tan15° = tan(45° + 30°)
3) tan105° = tan(60° + 45°)
4) tan195° = tan(135° + 60°)
5) tan165° = tan(135° + 30°)
6) tan(-7π/12)=
(Formule)
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