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Prove that √2+√2+√2+2 cos 8θ=2 cos θ. Or Prove that (1+cosπ8)(1+cos3π8)(1+cos5π8)(1+cos7π8)=18

Answer»

Prove that 2+2+2+2 cos 8θ=2 cos θ.

Or

Prove that (1+cosπ8)(1+cos3π8)(1+cos5π8)(1+cos7π8)=18



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