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In trigonometry to prove that sin2π/7+sin4π/7+sin8π/7=√7/2 in trigonometry

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SOURCE: Trigonometry proofs

tan y/sin y = sec y; Can you sho me how to prove this?

Posted on Sep 22, 2008

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Trigonometry proofs


tan y/sin y = sec y; Can you sho me how to prove this?

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