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Exercises Trigonometry

Example 4 from Algebra and Trigonometry, 7.3 Unit Circle

Using a Graphing Calculator to Find Sine and Cosine

Evaluate $\cos (\frac{5 π}{3})$ using a graphing calculator or computer.

Work it out on paper first. Then open the solution one step at a time, and stop as soon as you can finish on your own.

Solution
Enter the following keystrokes:

$COS (5 \times π \div 3 ) ENTER$
$\cos (\frac{5 π}{3}) = 0.5$

Your turn

The book's Try It right after this example: same idea, new numbers. Only the answer is given.

Evaluate $\sin (\frac{π}{3}) .$

How did it go?

PreviousFinding a Cosine from a Sine or a Sine from a Cosine Next Finding a Reference Angle

From Algebra and Trigonometry (1st edition) by OpenStax (Rice University), section 7.3, licensed under CC BY 4.0. Original at openstax.org. We split the solution into steps; the words, numbers and figures are the book's. OpenStax doesn't endorse this site.