Asked by Anonymous

Evaluate the trigonometric function using its period as an aid.

cos 5pi

how would i go about finding the period and what is a period?
Answered by bobpursley
Period: When does it repeat itself?

Cosine repeats each 2PI, so

cos5Pi= cos(5PI-2PI)=cos3PI= cos(PI+2PI)= cos PI.

Answered by Anonymous
Cos 5 pi
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