JEE Advanced 2026 Paper 1 Mathematics Q12

Mathematics

Problem

Let α = (1 − 2 cos(π/11))(1 − 2 cos(3π/11))(1 − 2 cos(9π/11))(1 − 2 cos(27π/11))(1 − 2 cos(81π/11)). Then the value of 5 − α² is _____________.