Asked by Anonymous

cos 13 pi = ?

10 years ago

Answered by Reiny

cos 13π
= cos( 4(2π) + π) , 13π is 4 rotations + π
= cosπ
= -1

10 years ago

Answered by deeksha

cos13pi
= cos 13pi*180/pi
=cos2340degree
= cos(7*360-180)
= cos(180degree)
= -1
hope u understood:)

10 years ago

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