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Home Trigonometry Practice Identities of Halved Angles

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Identities of Halved Angles Practice Test

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Q1

Find $\sin 2\theta$ if $\cos \theta = $\frac{4}{5}$$ and $$\frac{3\pi}{2}$<\theta<2\pi$ .

Find the exact value of $\sin $15^{\circ}$$ using an appropriate half-angle identity.

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