Question
If tan 12θ x tan 6θ = 1 then the value of tan 9θ
isSolution
We know that ,If tanA ` ` tanB = 1 then A & B are complementary angles it means A + B = 90Ë As it is given by tan 12θ . tan 6θ = 1 so 12θ+6θ = 90Ë or 18θ = 90Ë So θ = 5Ë Hence tan 9θ = tan (9 x 5Ë) = tan 45Ë = 1
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