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what is the value of sin Π/5 and cos Π/5?

Quote: Originally Posted by maeca what is the value of sin Π/5 and cos Π/5? $\displaystyle \sin {\frac{\pi}{5}}= \frac{\sqrt{10-2 \sqrt{5}}}{4}$ $\displaystyle \cos {\frac{\pi}{5}}= \frac {\sqrt{5}+1}{4} $