Long description: Trig6Fig11
Alt text: Three diagrams illustrate the unit circle and the values of cosine and sine for angles of \(0^\text{degrees}\), between \(0\) and \(90\) degrees, and \(90^\text{degrees}\).
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- The first diagram shows an angle \(\theta\) at \(0^\text{degrees}\) on the unit circle, where the coordinates are shown as \(OQ = OP = 1\) and \(OR = 0\), illustrating that \(\text{cos}(0^\text{degrees}) = 1\) and \(\text{sin}(0^\text{degrees}) = 0\).
- The second diagram illustrates an angle \(\theta\) between \(0\) and \(90\) degrees on the unit circle, showing the relationships \(\text{cos}(\theta) = OQ\) and \(\text{sin}(\theta) = OR\), with the values represented as \(0 < \text{cos}(\theta) < 1\) and \(0 < \text{sin}(\theta) < 1\).
- The third diagram depicts an angle \(\theta\) at \(90^\text{degrees}\) on the unit circle, showing the values \(\text{cos}(90^\text{degrees}) = 0\) and \(\text{sin}(90^\text{degrees}) = 1\), with the coordinates shown as \(OQ = 0\) and \(OR = OP = 1\).