How do you use the half angle formula to simplify sin^2(pi/8)? | Socratic
trigonometry - How do you find the coordinate points for $\pi/8$, then $3\pi /8$, $5\pi/8$ and $-7\pi/8$? - Mathematics Stack Exchange
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Example 27 - Find value of tan pi/8 - Chapter 3 Class 11
Solved Use a half-angle formula to find the exact value of | Chegg.com