Trigonometric Functions, Ratios and Identities

A Trigonometric Function is a function of an angle expressed as the ratio of two of the sides of a right triangle that contains that angle; the sine, cosine, tangent, cotangent, secant, or cosecant. It is also known as a circular function. You can check the videos below to understand the concepts better:

 

 

 Vedantu 

Identities Allied & Multiple Angles Graphs & Compound Angles
Multiple & Half Angles

 

 

Unacademy

 

 

Etoos Education

 

 

 

GradeUp