Trigonometry - Exact Trigonometric Values and the Unit Circle

Trigonometry - Exact Trigonometric Values and the Unit Circle

Find the exact value of each of the following

\(\cos \left( -210^\circ \right)\)
\(\tan \left( \frac{2}{3}\pi \right)\)
\(\cos \left( 225^\circ \right)\)

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Answer:(a) \(-\frac{\sqrt{3}}{2}\), (b) \(-\sqrt{3}\), (c) \(-\frac{\sqrt{2}}{2}\)

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