Section 4 6
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Section 4.6. Graphs of Other Trigonometric Functions. Overview. In this section we examine the graphs of the other four trigonometric functions. After looking at the basic, untransformed graphs we will examine transformations of tangent, cotangent, secant, and cosecant.

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Section 4.6

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Section 4 6

Section 4.6

Graphs of Other Trigonometric Functions


Overview

Overview

  • In this section we examine the graphs of the other four trigonometric functions.

  • After looking at the basic, untransformed graphs we will examine transformations of tangent, cotangent, secant, and cosecant.

  • Again, extensive practice at drawing these graphs using graph paper is strongly recommended.


Tangent and cotangent

Tangent and Cotangent

  • Three key elements of tangent and cotangent:

  • For which angles are tangent and cotangent equal to 0? These will be x-intercepts for your graph.

  • For which angles are tangent and cotangent undefined? These will be locations for vertical asymptotes.

  • For which angles are tangent and cotangent equal to 1 or -1? These will help to determine the behavior of the graph between the asymptotes.


Y tan x

y = tan x


Y cot x

y = cot x


Transformations

Transformations

|A| = amplitude (affects the places where tangent or cotangent is equal to 1 or -1)

π/B = period (distance between asymptotes). The asymptotes will keep their same relative position

C/B = phase (horizontal) shift. Left if (+), right if (-)


Examples graph the following

Examples—Graph the Following


Secant and cosecant

Secant and Cosecant

  • The graphs of secant and cosecant are derived from the graphs of cosine and sine, respectively:

  • Where sine and cosine are 0, cosecant and secant are undefined (location of vertical asymptotes).

  • Where sine and cosine are 1, cosecant and secant are also 1.

  • Where sine and cosine are -1, cosecant and secant are also -1.


Y csc x

y = csc x


Y sec x

y = sec x


Transformations1

Transformations

  • To graph a transformation of cosecant or secant, graph the transformation of sine or cosine, respectively, then use the reciprocal strategy previously discussed:

|A| = amplitude (affects the places where secant or cosecant is equal to 1 or -1)

2π/B = period (distance between asymptotes)

C/B = phase (horizontal) shift, left if (+), right if (-)


Examples graph the following1

Examples—Graph the Following


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