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What is cosine of 8pi/3

What is cosine of 8pi/3
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What is cosine of 8pi/3

User Denat Hoxha
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cos ( 8pi /3 ) = ?
= cos ( 2 pi + ( 2pi / 3) )
= cos ( 2 pi /3 )
= - 1 / 2
User Tomaoq
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