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To understand trigonometry, it is most useful to first understand two properties of triangles: the Pythagorean theorem and the relationships between similar The trigonometric functions are based on the unit circle, One can easily convert between these two measures by keeping in mind that a 180 angle. These angle measures belong to special triangles. If you remember these special triangles you can easily find the ratios for all the trig functions. Below are pdf. Gives us a summary plus examples of trigonometric functions in the Cartesian Plane -. Page 63 onlinemathlearning.co · m/trigonometric-ratios. Trigonometry Made Easy. by Kevin Skolnick Table of Contents Sine 3. Cosine 4. Tangent 5. Inverse vs. Reciprocal Functions 6. Radians and the Unit Circle 8. The trigonometric ratios can be extended to include obtuse angles and this will be done in the module, Further Trigonometry. If ? is an obtuse angle then the Trigonometric functions for all angles 9 Inverse Functions and Trigonometric Equations made easier if we think of it as a "cyclic" substitution. In Example 2.2.2, it was quite easy to find the cosine and sine of the quadrantal angles, angle made between the terminal side of ? and the x-axis.Contents. What is Trigonometry? Triangle Review. Pythagorean Theorem. Trigonometric Ratios in Right Triangles. Finding Trigonometric Ratios; Using