How do you use a calculator to evaluate \[\cos( - 110^{o})\] ?

Hint: In this question, we need to find the value of \[\cos( - 110^{o})\] with the use of a calculator . We can find the value of \[\cos( - 110^{o})\] with a regular Casio scientific calculator. First we need to set our calculator in degree mode. Then we need to type the given function in the calculator. Thus by following the steps below we can find the value of \[\cos( - 110^{o})\] using a calculator.

Complete step-by-step answer:
Given, \[\cos( - 110^{o})\]
Here we need to find the value of \[\cos( - 110^{o})\] with the use of calculator
First, we need to take our calculator. Then we need to set our calculator in degree mode.
The procedure to set degree mode in our calculator is first we need to press shift then mode. Then degree mode is the third option.
After that we need to select the cos button on the calculator. Then we need to type our input \[( - 110)\] . First we need to press \[-\] and then \[110\] . We should write the input \[( - 110)\] in brackets. For that we need to press the ( and ) symbol in our calculator. Then we need to press the symbol \[( = )\] to get our answer. Then the answer will be displayed on the display of the calculator.
We should get \[- 0.\ 34202\ldots.\] in the display of the calculator.
Thus we get the value of \[\cos( - 110^{o})\] is \[- 0.\ 342\] in three decimal places.
Final answer :
The value of \[\cos( - 110^{o})\] is \[- 0.\ 342\]

Note: Using a calculator is a good and easy way to find the values of trigonometric functions , square values, cubic values etc… . Moreover, most calculators cannot return the values of the function in radical form. We can use two types of calculator to find the values namely Casio and canon. Most important thing that we need to check first is the mode of the calculator, that is, we need to make sure that the calculator is in degree mode.