Question

How do you do inverse trig functions on the calculator for example \[\sin \theta = 0.4\]?

Answer 1

Hint: In order to use inverse trigonometric functions, we need to understand that an inverse trigonometric function the domain of the inverse function is the range of the original function, and vice versa. To find the calculator is set to Degree mode. To convert a trigonometric ratio back to an angle measure, use the inverse function found above the same key as the function. Press, select the inverse function, either \[{\sin ^{ - 1}}\], \[{\cos ^{ - 1}}\], or \[{\tan ^{ - 1}}\] and enter the ratio. Then, close the parentheses and select the option.

Complete step-by-step answer:
The given function is
\[\sin \theta = 0.4\].
To find the inverse, it will depend upon your calculator. Look for one of the following: \[{\sin ^{ - 1}}\], \[\operatorname{Arcsin} \]or asin.
Typically, this would be a "2nd function" key,
So, use
"2nd Function",
\[{\sin ^{ - 1}}\] (or whatever is the given function),
The value (in this case (0.4),
Then press " ENTER " or "=" key.
On TI-84 calculator,
Enter the inverse trigonometric function of the trigonometric value you wish to convert to degrees. First press the 2nd key, then press the key for the trigonometric function at hand. For example, if you wish to convert the sine of 0.5 into degrees, press 2nd and then press Sin. The display will show \[{\sin ^{ - 1}}\], or inverse sine. Now enter 0.5 and a closing parenthesis.
Press ENTER and collect your answer. The result should be a number, expressed in degrees. For example, if you entered \[{\sin ^{ - 1}}\] of 0.5 and hit enter, the calculator will display 30, which is 30 degrees. Be sure to remember the closing parenthesis.
Hence, in this way we can find the value of inverse trig functions using a calculator.

Note: We must note that \[{\sin ^{ - 1}}\] returns a value in degrees and the other four return values in radians. You can easily convert the basic trigonometric functions into angles measured in degrees or radians using a TI-84 Plus calculator. The TI-84 Plus is capable of going in both directions - from the angle to the trigonometric measure.