write the exact value of cos 60+cos120- cos240+ cos300
kingmaker1210:
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cos60=1/2
cos120= -1/2
cos240= -1/2
cos300= 1/2
1/2 - 1/2 - (-1/2) + 1/2
1/2 - 1/2 = 0
- (-1/2) = +1/2
1/2 + 1/2 = 1
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