19–32 - Amplitude and Period Find the amplitude and period of the function, and sketch its graph. 19. у = cos 2x 20. y = – sin 2x 21. у -sin 3x 22. y = cos 47TX - 23. у 3 — 2 cos 3пх 24. у 3D —3 sin бx

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A: Solution of given question is written in below steps.

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A: see below the calculation

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A: Givensec-1(-3)

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A: We have to solve given problems:

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Q: (d) (e)

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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.