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In these lessons, we will learn

- how Trigonometric Graphs can be transformed.
- the amplitude and vertical shift of Trigonometric Graphs
- the period and phase shift of Trigonometric Graphs

Related Topics:

More Trigonometric Lessons

Stretching and Compressing of Graphs

The amplitude of a trigonometric function is the maximum displacement on the graph of that function.

In the case of sin and cos functions, this value is the leading coefficient of the function.

If *y* = *A* sin *x*, then the amplitude is |A|.

In the case of tan, cot, sec, and csc, the amplitude would be infinitely large regardless of the value of *A*. However, for a limited domain, the value of *A* would determine the maximum height of these functions.

The period of a function is the displacement of *x* at which the graph of the function begins to repeat.

Consider *y* = sin *x*

The value *x* = 2π is the point at which the graph begins to repeat that of the first quadrant.

The coefficient of *x* is the constant that determine the period.

The general form is

y=AsinBx

where |A| is the amplitude andBdetermines the period.

For the functions sin, cos, sec and csc, the period is found by

Find the period of the graph

**Solution:**

Since *B* = 2, the period is

The general form for the equation of the sine trigonometric function is

The graphy=AsinB(x+p)

whereAis the amplitude, the period is calculated by the constantB, andpis the phase shift.

A similar general form can be obtained for the other trigonometric functions.

**Example:**

Find the amplitude, period and phase shift of

*Solution:*

Rewrite

The amplitude is 2, the period is π and the phase shift is units to the left.

Periodic Functions Definition, Period, Phase Shift, Amplitude, Vertical Shift.

Transformation of sin and cos with period and phase shift.

The videos explained how to the amplitude and period changes and what numbers in the equations.

Part 1: See what a vertical translation, horizontal translation, and a reflection behaves in three separate examples.

In this set of videos, we see how the line of equilibrium is affected by a vertical shift, and how the starting point is affected by a horizontal shift (phase). Shifts of graphs up and down are also called translations.

Part 2: An example of how the tangent graph and its asymptotes are affected different transformations. An example that includes every kind of transformation possible, all in one problem, is shown.

You can use the Mathway widget below to practice Trigonometry or other math topics. Try the given examples, or type in your own problem. Then click "Answer" to check your answer.