4×Cos2π/7×cosπ/7 -1 = 2×cosπ/7 prove this plzDo it by changing terms of the left side only
Sanwal , 6 Years ago
Grade 12th pass
Trigonometry> 4×Cos2π/7×cosπ/7 -1 = 2×cosπ/7 prove this...
1 Answers
Arun
Last Activity: 6 Years ago
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