Trigonometry - Exact Trigonometric Values and the Unit Circle

Trigonometry - Exact Trigonometric Values and the Unit Circle

TGM Original Questions

Given the basic angle, \(\alpha\), and the quadrant in which \(\theta\) lies, find the value of \(\theta\).

  1. \(\alpha = 60^{\circ}\), \(\theta\) is in the \(2^{\text{nd}}\) quadrant, \(-180^{\circ} < \theta < 180^{\circ}\).
  2. \(\alpha = 35^{\circ}\), \(\theta\) is in the \(4^{\text{th}}\) quadrant, \(0^{\circ} < \theta < 360^{\circ}\).
  3. \(\alpha = \frac{4\pi}{9}\), \(\theta\) is in the \(1^{\text{st}}\) quadrant, \(0 < \theta < 2\pi\).
  4. \(\alpha = \frac{3\pi}{7}\), \(\theta\) is in the \(3^{\text{rd}}\) quadrant, \(-4\pi < \theta < -2\pi\).

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Answer:(i) \(120^\circ\). (ii) \(325^\circ\). (iii) \(\dfrac{4\pi}{9}\). (iv) \(-\dfrac{18\pi}{7}\).

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