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Evaluating Sine and Cosine of Special Acute Angles

Videos, worksheets, solutions, and activities to help Algebra 2 students learn how to evaluate sine and cosine of special acute angles (given in radians).

Evaluating Sine and Cosine at Special Acute Angles :
If you want to make your math life incredibly easier, memorize the sine and cosine values for pi/3, pi/4, and pi/6, as well as 0, pi/2, and pi. These values constantly reappear throughout Trigonometry and pre-Calculus problems and proofs. When evaluating sine, it is also useful to memorize the conversion from radians to degrees for these values; for example, to remember that pi/6 is equivalent to 30°.
PM12 - 3.4 Special Angles (Sine & Cosine) - part 1
PM12 - 3.4 Special Angles (Sine & Cosine) - part 2

Finding the special trig ratios for the quadrantal angles and 30, 45, and 60 degrees (radians as well)

Rotate to landscape screen format on a mobile phone or small tablet to use the Mathway widget, a free math problem solver that answers your questions with step-by-step explanations.

You can use the free Mathway calculator and problem solver below to practice Algebra or other math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.

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