\(tan \frac {\pi}{11} + 4sin \frac {3\pi}{11}\)= \(\sqrt 11\)
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Shourya Pandey
·
4 years, 1 month ago

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@Shourya Pandey
–
By the way, you should put braces around your eleven's that are under the square root, so that the entire radican is covered by the bar of the square root. It should look like \sqrt{11} rather than \sqrt11, so that \(\sqrt{11}\), rather than \(\sqrt11\), appears. :)
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Bob Krueger
·
4 years, 1 month ago

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But in my book its tan and not sine....but yes it must be sine.....
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Kiran Patel
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4 years, 1 month ago

Are you sure this is what we have to prove? Because I just used a calculator and saw that \(tan(\frac{3\pi}{11}) +4tan(\frac{2\pi}{11})\) is not equal to the square root of \(11\). Am I somehow misunderstanding your problem?
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Mursalin Habib
·
4 years, 1 month ago

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TopNewestThe problem actually is as follows, and I request the user to edit it. Iam not giving the solution, and that googling it will give the solution:

Prove that \(tan \frac {3\pi}{11} + 4sin \frac {2\pi}{11}\)= \(\sqrt 11\)

Infact, even the following relations hold:

\(tan \frac {3\pi}{11} + 4sin \frac {2\pi}{11}\)= \(\sqrt 11\)

\(tan \frac {4\pi}{11} + 4sin \frac {\pi}{11}\)= \(\sqrt 11\)

\(tan \frac {5\pi}{11} - 4sin \frac {4\pi}{11}\)= \(\sqrt 11\)

\(tan \frac {2\pi}{11} - 4sin \frac {5\pi}{11}\)= \(-\sqrt 11\)

\(tan \frac {\pi}{11} + 4sin \frac {3\pi}{11}\)= \(\sqrt 11\) – Shourya Pandey · 4 years, 1 month ago

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– Bob Krueger · 4 years, 1 month ago

By the way, you should put braces around your eleven's that are under the square root, so that the entire radican is covered by the bar of the square root. It should look like \sqrt{11} rather than \sqrt11, so that \(\sqrt{11}\), rather than \(\sqrt11\), appears. :)Log in to reply

But in my book its tan and not sine....but yes it must be sine..... – Kiran Patel · 4 years, 1 month ago

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– Shourya Pandey · 4 years ago

maybe some mistakeLog in to reply

Are you sure this is what we have to prove? Because I just used a calculator and saw that \(tan(\frac{3\pi}{11}) +4tan(\frac{2\pi}{11})\) is

notequal to the square root of \(11\). Am I somehow misunderstanding your problem? – Mursalin Habib · 4 years, 1 month agoLog in to reply