Cosπ/13 = approximately 1 so 2Cosπ/13 = 2
Cos9π/13 = - 0.5 (the minus sign because the angle is in the second quadrant)
Cos3π/13 = 0.7
Cos5π/13 = 0.3
Then : 2*(1) * (- 0.5) + 0.7 + 0.3 = - 1 + 1 = 0
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Cosπ/13 = approximately 1 so 2Cosπ/13 = 2
Cos9π/13 = - 0.5 (the minus sign because the angle is in the second quadrant)
Cos3π/13 = 0.7
Cos5π/13 = 0.3
Then : 2*(1) * (- 0.5) + 0.7 + 0.3 = - 1 + 1 = 0