Use your knowledge of the graphs of the sine and cosine functions to write an equation for the given graphs in #19 and #20. Feel free to use Desmos or GeoGebra to check your work. each) 曲會 C : 3 19) X. 2m 3TT 4TT 5TT 6T TT -5m -4TT -3T -2T -TT -1 -3 Equation:

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A:

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A:

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Fundamentals of Trigonometric Identities

Trigonometric Identities are the equalities that involve trigonometry functions and hold for all the values of variables given in the equation.