Trigonometric Identities Worksheet With Solutions. In the same triangle, tan(theta)=x/y, so substituting we get tan(theta). Trigonometric Identities: Identities are equations true for any value of the variable.
The Trigonometric Identities are equations that are true for Right Angled Triangles. (If it is not a Right Angled Triangle go to the Triangle Identities page.) You have seen quite a few trigonometric identities in the past few pages. We prove identities in order to develop the ability to transform one trigonometric expression into an-other. You might like to read about Trigonometry first!
As we will see, they are all derived from the denition of the trigonometric functions.
This quality, short, learning exercise provides practice verifying trigonometric identities and completing the included blank unit circle.
A tutorial with Several examples including their detailed solutions are presented. You might like to read about Trigonometry first! Each one has model problems worked out step by step, practice problems, as well as challenge questions at the sheets end.