Simplify $\displaystyle (4 \cos^2 9^\circ -3)(4\cos^2 27^\circ -3 ) $ in terms of tangent.

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- Aug 3rd 2012, 05:53 AMshiny718Simplify trigonometric function in terms of tangent
Simplify $\displaystyle (4 \cos^2 9^\circ -3)(4\cos^2 27^\circ -3 ) $ in terms of tangent.

- Aug 3rd 2012, 06:10 AMProve ItRe: Simplify trigonometric function in terms of tangent
- Aug 3rd 2012, 07:14 AMshiny718Re: Simplify trigonometric function in terms of tangent
Sorry but I tried to use your hint but I couldn't get anywhere. Help please?

- Aug 3rd 2012, 07:16 AMProve ItRe: Simplify trigonometric function in terms of tangent
- Aug 3rd 2012, 09:05 AMshiny718Re: Simplify trigonometric function in terms of tangent
Umm the correct answer I have in hand is $\displaystyle tan 9^\circ $. But I can't simplify all my way to this answer. Help me pls?