Download Trigonometric Keys - Cedar Valley College

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G. Trigonometric Keys
There are three trigonometric functions and three inverse trigonometric functions that
are built into the TI-83 and the TI-84. The MODE (radian/degree) will affect the output of
the trigonometric functions. In radian mode you will often use . You can access by
entering
.
1.
(sine)
(cosine)
(tangent) keys are the main trigonometric keys.
You can evaluate these functions for any real number for which the function is defined.
The mode will determine the output so it is important that you check the setting before
evaluation of the function.
Radian Mode
Sine
Cosine
Tangent
2. Cosecant, Secant, and Cotangent are not built in to the TI-83 or the TI-84 so you will
have to use the reciprocal key or put the expression in rational form to evaluate. You
have to be careful with coefficients. The coefficients should not be placed in the
denominator.
Radian Mode
csc(3.1)
4sec(-5.1)
-2cot(1.5)
3.
are the three trigonometric inverse functions that are built in to the
TI-83. The mode (radian/degree) will determine the output.
(a) The input for
must be in the interval [-1,1] and the output will be in the range
in radian mode and the output will be
in degree mode. If you
enter a number outside the range [-1,1] you will get an error message.
Radian Mode
(b) The input for the
Degree Mode
Complex answer
for nonreals.
function must be in the range [-1,1]. The output in radian
mode will be in the range
and will be in the range
in degree mode. If
you enter a number outside the range [-1,1] you will get an error message.
Radian Mode
(c) The input for
Degree Mode
Mix functions.
can be any real number. The output will be in the range
in radian mode and
in degree mode.
Radian Mode
Degree Mode
Mix functions.
Updated 2-16-09