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Hello,Since I could not solve the following equation though applying all information I have about trigonometry, I would very appreciate if anybody could help or make some suggestion. Thanks for your time.cos(2pi/11)+cos(4pi/11)+cos(6pi/11)+cos(8pi/11)+cos(10pi/11)=?(Answer: -1/2)
Those angles be not on the unit circle, matey. Aaargh!Ahem. I don't think they have coterminal angles on the unit circle, either.Which means...use a calculator! Right? Don't tell me there's a goofy trig identity that will come to the rescue. I hates trig identities.
I didn't know it be talk like a pirate day. Yarr!That scurvy dog, ryos, be correct. There be no identity that will rescue ye, landlubber. At least, none that me or my parrot know. Arr!
Aye aye, captain Rottingham! Calculators at deck, rrreform in rradials if ye think it will make ye life easier.
Me only contribution, mateys, is this ere lubberly sketch-ning
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