value of cos120

cos 120 = cos (180 - 60) = - cos 60
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I think cos60 = cos120 =1/2
 
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Cos 60= -1/2 100% sure
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cos 120 = -1/2
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Sorry cos 120
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Cos 120 =cos(180-60)= -cos(60) = -root3/2
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-1/2
 
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-1/2
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Value of cos 120degree is -1/2.
But if u want the exact value of cos 120 degree then it is -0.5.
I tell how.see:-
cos120=cos(180-60)
=-cos(60) (i.e;cos(180-thita)= -cos(thita)
=- 1/2 (cos60=1/2)
=-0.5
Hope dis helped u....
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value of cos 120 = -cos60 = -1/2
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-1/2
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-1/2
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-1/2
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