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Flag Trigonometry> 4×Cos2π/7×cosπ/7 -1 = 2×cosπ/7 prove this...
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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

Sanwal , 7 Years ago
Grade 12th pass
anser 1 Answers
Arun
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Your question is wrong. Please check and repost it. You can also attach an image. I will be happy to help you.
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