Prove that; 8 cos 3 </msup> &#x2061;<!-- ⁡ --> ( &#x03C0;<!-- π

Walker Guerrero

Walker Guerrero

Answered question

2022-05-24

Prove that; 8 cos 3 ( π 9 ) 6 cos ( π 9 ) = 1

Answer & Explanation

Carter Escobar

Carter Escobar

Beginner2022-05-25Added 9 answers

2 ( 4 cos 3 π 9 3 cos π 9 )
As cos 3 θ = 4 cos 3 θ 3 cos θ
2 ( cos ( 3 × π 9 ) )
2 × cos ( π 3 )
2 × 1 2 = 1

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