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I. Entering the Function in the Graph Window
B. Trigonometric Functions
A TI-86 has keys for three trigonometric functions: sine, cosine, and tangent. You will have to use a ratio to graph cosecant, secant, and cotangent.
1. Entering Sine, Cosine, Tangent
You will need to use parentheses when entering most trigonometric functions.
Example: Enter the functions shown below.
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Enter a simple trig function.
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Close the parentheses.
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The
 key is
  . |
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You cannot enter this as it
is written.
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You need parentheses around
the fraction.
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Functions entered. |
2. Entering Cosecant, Secant, Cotangent
These functions will require the use of the reciprocal identities.
Example: Enter the following functions.
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Put parentheses around the 2x. |
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The coefficient is not put in the denominator. |
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There are several ways that
this function could be entered, but until you have experience entering functions, just use the keystrokes shown in the window below. |
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Functions entered. |
