Find the exact value of cos 5pi/6
Question
Answer:
On the trig unit circle,cos(5π/6)=cos(−π/6+π)=−cos(π/6)
Trig Table of Special Arcs gives
cos(5π/6)=−cos(π/6)=-[tex] \frac{ \sqrt{3} }{2} [/tex]
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