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anonymous
 one year ago
How do you find cos(11pi/6)?
anonymous
 one year ago
How do you find cos(11pi/6)?

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misty1212
 one year ago
Best ResponseYou've already chosen the best response.1you need a good trig cheat sheet !

Michele_Laino
 one year ago
Best ResponseYou've already chosen the best response.0hint: we have: \[\Large \frac{{11\pi }}{6} = 2\pi  \frac{\pi }{6}\]

Michele_Laino
 one year ago
Best ResponseYou've already chosen the best response.0so we can write: \[\Large \cos \left( {\frac{{11\pi }}{6}} \right) = \cos \left( {2\pi  \frac{\pi }{6}} \right)\]

misty1212
 one year ago
Best ResponseYou've already chosen the best response.1find \(\frac{11\pi}{6}\) on the unit circle on the the last page of the cheat sheet, then look at the coordinates of the corresponding point the first coordinate is cosine

misty1212
 one year ago
Best ResponseYou've already chosen the best response.1\[\color\magenta\heartsuit\]

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0What if you need to find tangent?

Michele_Laino
 one year ago
Best ResponseYou've already chosen the best response.0you can apply this identity: \[\Large \begin{gathered} \tan \left( {\frac{{11\pi }}{6}} \right) = \tan \left( {2\pi  \frac{\pi }{6}} \right) = \hfill \\ \hfill \\ = \frac{{\tan \left( {2\pi } \right)  \tan \left( {\frac{\pi }{6}} \right)}}{{1 + \tan \left( {2\pi } \right)\tan \left( {\frac{\pi }{6}} \right)}} \hfill \\ \end{gathered} \]

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0How do you know tan(11pi/6) equals tan(2pipi/6)?
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