How To Use Reference Angles to Evaluate Trigonometric Functions

This trigonometry video tutorial explains how to use reference angles to evaluate trigonometric functions such as sine, cosine, tangent, secant, cosecant, and cotangent with positive and negative angles in radians and degrees.. You need to have a good understanding of right triangle trigonometry, SOHCAHTOA, 30-60-90 triangle and the 45-45-90 triangle. This tutorial contains plenty of examples and practice problems.

Trigonometry - Basic Introduction:

Angle of Elevation Problems:

Evaluating Trig Functions Given a Point:

A Simple Way to Remember Trig Values:

Exact Value of 5 Remaining Trig Functions:

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How To Graph Trig Functions:

How To Graph Sine and Cosine:

Evaluating Inverse Trig Functions:

Finding The Missing Side of a Triangle:

Finding The Missing Angle of a Triangle:

Two Triangle Trigonometry Problems:

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Bearings Vs Direction - Word Problems:

Bearing Problems and Navigation:

Two Triangle Problems - More Examples:

Trigonometry Final Exam Review:

Final Exams and Video Playlists:

Full-Length Videos and Worksheets:

Trigonometry Formula Sheet:

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[koushikibanerjee]

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[jordankerr]

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[jahlijahman]

what about an angle like 205.5? how do you apply the 30, 60, 90 triangle there?

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