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sweet-ann [11.9K]
3 years ago
15

Evalaute the following without using a calculator: cos(13pi/6)

Mathematics
2 answers:
strojnjashka [21]3 years ago
6 0
Answer is in the attachment below. Please open it up in a new window to see it in full.

Harman [31]3 years ago
5 0
the\ cos\ function\ is\ periodic:\ \ \ the\ period=2 \pi\\\\cos(2 \pi + \alpha )=cos \alpha \\\\------------------------\\\\cos\bigg{(} \frac{\big{13 \pi }}{\big{6}}\bigg{)}=cos\bigg{(} 2 \pi +\frac{\big{ \pi }}{\big{6}}\bigg{)}=cos\bigg{(} \frac{\big{ \pi }}{\big{6}}\bigg{)}= \frac{\big{ \sqrt{3} }}{\big{2}}
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