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How would you find the exact values for sin(67.5)?

Quote: Originally Posted by PDBear How would you find the exact values for sin(67.5)? Use half-angle identity $\displaystyle \sin \frac{x}{2}=\pm \sqrt{\frac{1 - \cos x}{2}}$ Now find $\displaystyle \sin\left(\frac{135}{2}\right)$