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OpenStudy (anonymous):
what is sin 2pi/3? how do you solve wihtout a calculator?
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OpenStudy (anonymous):
Root3/2.
OpenStudy (anonymous):
but how do i solve it? i completely forgot trig
myininaya (myininaya):
unit circle
OpenStudy (anonymous):
2pi/3 is the same at pi/3. pi/3 is a 60 degree angle. Sin is Opposite/Hypotenuse. so it would be Root3/2.
myininaya (myininaya):
\[\frac{2 \pi}{3} \cdot \frac{180^o}{\pi}=120^o\] maybe you think better using degrees
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