Exact Trig Values from the Unit Circle

At angle θ on the unit circle, the point is (cos θ, sin θ). Memorize values at 0, π/6, π/4, π/3, π/2 and use symmetry for the rest.

Algebra 2Common Core HSF-TF.A.3F-TFVerified correct ✓

Worked examples

Find the exact value of tan(45°). Round to 4 decimal places.
Answer: 1

Find the exact value of cos(210°). Round to 4 decimal places.
Answer: -0.866

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