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VCE 12 Methods 2023

3.03 Tangent functions

Worksheet
Tangent function
1

Consider the equation y = \tan x.

a

Complete the table with values in exact form:

x0\dfrac{\pi}{4}\dfrac{\pi}{2}\dfrac{3 \pi}{4}\pi\dfrac{5 \pi}{4}\dfrac{3 \pi}{2}\dfrac{7 \pi}{4}2 \pi
\tan x
b

Sketch the graph of y = \tan x on the domain -2\pi \leq 0 \leq 2\pi.

c

Graph the line y = 1 on the same coordinate plane.

d

Hence, state the exact solutions to the equation \tan x = 1 over this domain.

e

State the value of \tan \left(-2 \pi\right).

f

State the sign of \tan \left( \dfrac{- \pi}{6} \right).

g

State the sign of \tan \dfrac{9 \pi}{5}.

h

Which quadrant of a unit circle does an angle with measure \dfrac{9 \pi}{5} lie in?

2

Consider the graph of y = \tan x shown:

a

State the sign of \tan \dfrac{9 \pi}{5}.

b

Which quadrant does the angle \dfrac{9 \pi}{5} lie in?

\frac{1}{5}π
\frac{2}{5}π
\frac{3}{5}π
\frac{4}{5}π
\frac{6}{5}π
\frac{7}{5}π
\frac{8}{5}π
\frac{9}{5}π
x
-1
1
y
3

Consider the unit circle shown:

a

Express \tan \theta in terms of \sin \theta and \cos \theta.

b

Does the graph of y = \tan x repeat in regular intervals? Explain your answer.

-1
1
x
-1
1
y
4

Consider the graph of y = \tan x for - 2 \pi \leq x \leq 2 \pi.

a

State the y-intercept of the graph.

b

State the period of the function.

c

State the equations of the vertical asymptotes on the domain 0 \leq x \leq 2\pi.

d

Does the graph of y=\tan x increase or decrease between any two successive vertical asymptotes?

e

If x \gt 0, find the least value of x for which \tan x = 0.

-2\pi
-\frac{3}{2}\pi
-1\pi
-\frac{1}{2}\pi
\frac{1}{2}\pi
1\pi
\frac{3}{2}\pi
2\pi
x
-4
-3
-2
-1
1
2
3
4
y
5

Consider the graph of y = \tan x for - 2 \pi \leq x \leq 2 \pi.

a

Select the word that best describes the graph:

A

Periodic

B

Decreasing

C

Even

D

Linear

b

Determine the range of y = \tan x.

c

As x increases, determine the equation of the next asymptote of the graph after x = \dfrac{7 \pi}{2}.

-2\pi
-\frac{3}{2}\pi
-1\pi
-\frac{1}{2}\pi
\frac{1}{2}\pi
1\pi
\frac{3}{2}\pi
2\pi
x
-4
-3
-2
-1
1
2
3
4
y
6

Consider the graph of y = \tan x for - 2 \pi \leq x \leq 2 \pi.

a

Determine the sign of \tan x for \\ \pi \leq x < \dfrac{3 \pi}{2}.

b
In which quadrant of a unit circle is angle x if \pi \leq x < \dfrac{3 \pi}{2}.
c

Determine the sign of \tan x for \\- \dfrac{\pi}{2} < x \leq 0.

d
In which quadrant of a unit circle is angle x if - \dfrac{\pi}{2} < x \leq 0.
e

Describe the function y = \tan x as odd, even or neither.

-2\pi
-\frac{3}{2}\pi
-1\pi
-\frac{1}{2}\pi
\frac{1}{2}\pi
1\pi
\frac{3}{2}\pi
2\pi
x
-4
-3
-2
-1
1
2
3
4
y
7

Consider the function y = \tan \theta.

a

\tan \theta is defined as \dfrac{\text{opposite }}{\text{adjacent }} for 0 \leq \theta < \dfrac{\pi}{2} in a right-angled triangle.

What happens to the value of \tan \theta as \theta increases from 0 to \dfrac{\pi}{2}?

b

The graph of y = \cos x for 0 \leq x \leq 2 \pi is provided. For what values of x is \cos x = 0?

\frac{1}{2}π
\frac{3}{2}π
x
-1
1
y
c

Hence, for what values of x between 0 and 2 \pi is \tan x undefined?

d

Complete the table below:

x0\dfrac{\pi}{4}\dfrac{3 \pi}{4}\pi\dfrac{5 \pi}{4}\dfrac{7 \pi}{4} 2 \pi
\tan x
e

Sketch that graph of y = \tan x for 0 \leq x \leq 2 \pi.

f

Which of the following terms describes the graph?

A

Periodic

B

Decreasing

C

Even

D

Linear

g

Which of the following terms is not an appropriate description of the graph of y = \tan x?

A

Amplitude

B

Range

C

Period

D

Asymptotes

h

State the period of y = \tan x in radians.

i

State the range of y = \tan x.

j

As x increases, what would be the next asymptote of the graph after x = \dfrac{7 \pi}{2}?

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Outcomes

U34.AoS1.14

identify key features and properties of the graph of a function or relation and draw the graphs of specified functions and relations, clearly identifying their key features and properties, including any vertical or horizontal asymptotes

U34.AoS1.10

the concepts of domain, maximal domain, range and asymptotic behaviour of functions

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