Question
Find all angles, \( 0^{\circ} \leq \theta<360^{\circ} \), that solve the following equation. \[ \cos \theta=1 \]
Ask by Love Barber. in the United States
Mar 20,2025
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Answer
The only angle between \(0^\circ\) and \(360^\circ\) that satisfies \(\cos \theta = 1\) is \(0^\circ\).
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The Deep Dive
The equation \(\cos \theta = 1\) is quite straightforward! In the unit circle, the cosine of an angle represents the x-coordinate. The x-coordinate equals 1 at the angle \(0^{\circ}\), which is also equivalent to \(360^{\circ}\) (since it wraps around). Therefore, the only solution to the equation within the specified range is: \[ \theta = 0^{\circ} \] So, the solution set is simply \(\{ 0^{\circ} \}\).