## Question

###### Figure $4-1 b$ shows a unit circle in a uv-coordinate system and an angle of $50^{\circ}$ in standard position. Use the definitions of cosine and since to explain why $\cos 50^{\circ}=u$ and $\sin 50^{\circ}=v$ (GRAPH CAN'T COPY)

Figure $4-1 b$ shows a unit circle in a uv-coordinate system and an angle of $50^{\circ}$ in standard position. Use the definitions of cosine and since to explain why $\cos 50^{\circ}=u$ and $\sin 50^{\circ}=v$ (GRAPH CAN'T COPY)

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