JEE Main 2023
Trigonometry
Trigonometric Ratio and Identites
Easy
Question
The value of 36 ( 4 cos 2 9 ∘ − 1 ) ( 4 cos 2 27 ∘ − 1 ) ( 4 cos 2 81 ∘ − 1 ) ( 4 cos 2 243 ∘ − 1 ) is :
Options
Solution
A 18
The value of 36 ( 4 cos 2 9 ∘ − 1 ) ( 4 cos 2 27 ∘ − 1 ) ( 4 cos 2 81 ∘ − 1 ) ( 4 cos 2 243 ∘ − 1 ) is :
A 18