Respuesta :

royalroyfan1
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.
AL2006
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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good job