Trigonometry - Exact Trigonometric Values and the Unit Circle

Trigonometry - Exact Trigonometric Values and the Unit Circle

TGM Original Questions

Without using a calculator, find the exact value of each of the following.

\(\sin 225^\circ\)

\(\cos 150^\circ\)

\(\tan(-300^\circ)\)

\(\sin(-120^\circ)\)

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Answer:(i) \(-\frac{\sqrt2}{2}\) (ii) \(\sqrt3\) (iii) \(-\frac{\sqrt3}{2}\) (iv) \(-\frac{\sqrt3}{2}\)

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