4×Cos2π/7×cosπ/7 -1 = 2×cosπ/7 prove this plz Do it by changing terms of the left side only

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4×Cos2π/7×cosπ/7 -1 = 2×cosπ/7 prove this plz Do it by changing terms of the left side only

4×Cos2π/7×cosπ/7 -1 = 2×cosπ/7 prove this plz
Do it by changing terms of the left side only

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4×Cos2π/7×cosπ/7 -1 = 2×cosπ/7 prove this plz Do it by changing terms of the left side only

4×Cos2π/7×cosπ/7 -1 = 2×cosπ/7 prove this plzDo it by changing terms of the left side only

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4×Cos2π/7×cosπ/7 -1 = 2×cosπ/7 prove this plz
Do it by changing terms of the left side only