If the sin 60° is square root 3 over 2, then the cos ____° = _____. (4 points) 30° ; 1 over 2 60° ; square root 2 over 2 30° ; square root 3 over 2 60° ; 1
Answer:
cos ² 60=1-sin² 60=1-(√3/2)²=1-3/4=(4-3)/4=1/4
cos 60=√(1/4)=1/2
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