Graphs of Basic Trigonometric Functions
The graphs and properties such as domain, range, vertical asymptotes of the 6 basic trigonometric functions: sin (x), cos (x), tan(x), cot (x), sec (x) and csc (x) are explored using an applet.
Once you finish the present tutorial, you may want to go through a self test on trigonometric graphs. If needed, Free graph paper is available.
TUTORIAL:click on the button above "click here to start" and MAXIMIZE the applet window obtained.

Click on the radio button of sin (x) and use the graph to determine
the range of sin (x). What is the domain of sin (x)?
Answer

Click on the radio button of cos (x) and use the
graph to determine the range of cos (x). What is the domain of cos (x)?
Answer

Click on the radio button of tan (x). The red broken lines are the
vertical asymptotes for the graph of tan (x). Use the fact that
tan(x) = sin(x) / cos(x)
to find the domain of tan(x). (Hint: find the zeros of the denominator and
exclude them from the set of real numbers). The same zeros of the denominator
gives you equations of the vertical asymptotes. Find the vertical asymptotes.
Now use the graph of tan (x) to check your answers, domain and vertical
asymptotes, found analytically. Use the fact that vertical asymptotes means an
increases or decreases without bound to find the range of tan(x).
Answer

Click on the radio button of cot(x). The red broken lines are the
vertical asymptotes for the graph of cot(x). Use the fact that
cot(x) = cos(x) / sin(x)
to find the domain of cot(x). (Hint: find the zeros of the denominator and
exclude them from the set of real numbers). The same
zeros of the denominator gives you equations of the vertical asymptotes. Find
the vertical asymptotes. Now use the graph of cot(x) to check your answers,
domain and vertical asymptotes, found analytically. Use the concepts of vertical asymptotes to determine the range of cot(x).
Answer

Click on the radio button of sec(x). The red broken lines are the
vertical asymptotes for the graph of sec(x). Use the fact that
sec(x) = 1 / cos(x)
to find the domain of sec(x) and vertical asymptotes for the graph of sec(x).
Now use the graph of sec(x) to check your answers, domain and vertical
asymptotes, found analytically. Use the concepts of vertical asymptotes to
determine the range of sec(x).
Answer

Click on the radio button of csc(x). The red broken lines are the
vertical asymptotes for the graph of csc(x). Use the fact that
csc(x) = 1 / sin(x)
to find the domain of csc(x). (Hint: find the zeros of the denominator and
exclude them). The same zeros of the denominator gives you equations of the
vertical asymptotes. Find the vertical asymptotes. Now use the graph of csc(x) to check your answers, domain and vertical asymptotes, found analytically. Use the concepts of vertical asymptotes to determine the range of csc(x).
Answer
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Updated: February 2015
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