If $\theta$ is acute, the Half-angle Formula for the sine function is $\sin \frac{\theta}{2}=$ _____.
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The Half-angle Formula for the sine function is: $$\sin \frac{\theta}{2} = \pm \sqrt{\frac{1 - \cos \theta}{2}}$$ where the sign depends on the quadrant in which $\frac{\theta}{2}$ lies. Show more…
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