Palaniappan Palaniappan
  • 07-08-2017
  • Physics
contestada

Evaluate cosπ/11+cos3π/11+cos5π/11+cos7π/11+cos9π/11

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royalroyfan1
royalroyfan1 royalroyfan1
  • 07-08-2017
Using a calculator, the answer will be 1/2 as a result of all the / and use of opposite πs that form 18 making a whole circle.
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AL2006
AL2006 AL2006
  • 07-08-2017
The cosine repeats every 2pi, so the terms of the expression are all equal, and you have 5 cos(pi/11), which totals up to about 4.797 .
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