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Exercises: Sine, Cosine and Tangent on the unit circle

Consider on the unit circle: For which angles between $0^{\circ}$ and $360^{\circ}$ you have $\sin (α) = 0.5$ ?

$α = 30^{\circ}$
$α = 45^{\circ}$
$α = 60^{\circ}$
$α = 150^{\circ}$

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