OpenStax, Precalculus 2e §5.3 The Other Trigonometric Functions · Example 4 · Trigonometry · Unit circle

Using Identities to Evaluate Trigonometric Functions

ⓐ Given $s in (45°) = \frac{2}{2}, cos (45°) = \frac{2}{2},$ evaluate $t an (45°) .$
ⓑ Given $s in (\frac{5 π}{6}) = \frac{1}{2}, cos (\frac{5 π}{6}) = - \frac{3}{2}, evaluate sec (\frac{5 π}{6}) .$

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OpenStax, Precalculus 2e · §5.3 The Other Trigonometric Functions · Example 4

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