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The Complete Idiot's Guide to Trigonometry by Izolda Fotiyeva, Dmitriy Fotiyev

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In the previous chapter we dealt with shifting, stretching, and shrinking of the sinusoidal graphs. This chapter introduces the graphs of the other four trigonometric functions.

Graphs of Tangent Function

The graph of the tangent function is different from the sine and cosine graphs in two significant ways.

First, the domain is different. Recall that the domain (x-values) for both the sine and cosine functions is all real numbers; therefore, the graphs roll uninterrupted from negative infinity to positive infinity. Because we identify the tangent as a ratio ch12-1.png, it is clear that the tangent is undefined when the cosine is equal to 0, so the graph ...

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