#### DESCRIPTION:

This video lecture series from Khan Academy on Trigonometry includes Radians and Degrees, Using Trigonometric Functions, The Unit Circle definition of trigonometric function, Graph of the Sine Function, graphs of Trigonometric Functions, Trigonometric Identities, Law of Cosines, Law of Sines, Polar Coordinates and Trigonometric Word Problems..

#### OVERVIEW:

The unit circle definition of trigonometric function is a free educational video by Khan Academy.It helps students in grades 9,10,11,12 practice the following standards HSF.TF.A.2,HSF.TF.A.3,HSF.TF.A.4.

This page not only allows students and teachers view The unit circle definition of trigonometric function but also find engaging Sample Questions, Apps, Pins, Worksheets, Books related to the following topics.

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1. HSF.TF.A.2 :** Explain how the unit circle in the coordinate plane enables the extension of trigonometric functions to all real numbers, interpreted as radian measures of angles traversed counterclockwise around the unit circle.

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2. HSF.TF.A.3 :** Use special triangles to determine geometrically the values of sine, cosine, tangent for π/3, π/4 and π/6, and use the unit circle to express the values of sine, cosine, and tangent for x, π + x, and 2π - x in terms of their values for x, where x is any real number..

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3. HSF.TF.A.4 :** Use the unit circle to explain symmetry (odd and even) and periodicity of trigonometric functions..

GRADES:

**9101112**

STANDARDS:

**HSF.TF.A.2HSF.TF.A.3HSF.TF.A.4**