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What is the value of #cos((2pi)/3)#?

1 Answer

Jul 30, 2016

#-1/2#

Explanation:

#(2pi)/3 "is an angle in the " color(blue)"2nd quadrant where the cos ratio is negatve"#

#rArrcos((2pi)/3)=-cos(pi-(2pi)/3)=-cos(pi/3)=-1/2#

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