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