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Question

The value of tan6π933tan4π9+27tan2π9 is

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Solution

tan6π933tan4π9+27tan2π9
Assuming tanπ9=t
tan6π933tan4π9+27tan2π9=t633t4+27t2 (1)

Since, tan3θ=3tanθtan3θ13tan2θ
Putting θ=π9, we get
tanπ3=3tanπ9tan3π913tan2π93=3tt313t23=t(3t2)13t23(13t2)=t(3t2)
Squaring on both sides,
3(1+9t46t2)=t2(9+t46t2)3=t633t4+27t2
From equation (1),
tan6π933tan4π9+27tan2π9=3

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