For waves, it is more common to use radians (RAD) rather than degrees (DEG) when measuring angles. Radians are the preferred unit for measuring angles in mathematical calculations involving waves, as they simplify trigonometric functions and equations. Using radians also allows for more accurate and precise calculations when working with wave properties such as phase shifts, wavelengths, and frequencies. **

The main difference between rad and deg is the unit of measurement they represent. "Rad" stands for radians, which is a unit used to measure angles in the context of trigonometry and calculus. Radians are based on the radius of a circle and are used in advanced mathematics. "Deg" stands for degrees, which is a more common unit of measurement for angles in everyday use. Degrees are based on dividing a circle into 360 equal parts, with each part representing one degree. **

In waves, it is more common to use radians (RAD) for measuring angles rather than degrees (DEG). Radians are preferred because they are a more natural unit of measurement when dealing with circular motion and trigonometric functions, which are often used to describe wave behavior. Radians also simplify mathematical calculations involving waves, making them a more practical choice for this context. **

The setting Rad is used when you want to input or receive trigonometric function values in radians, which is the default setting in most cases. On the other hand, the setting Deg is used when you want to input or receive trigonometric function values in degrees. You can switch between these settings depending on the context of the problem you are working on in TR. **

To deactivate the DEG mode on the Casio fx-991DE Plus, you need to press the "MODE" button, then select "3" for "Deg" to switch to "Rad" or "Gra" mode. This will deactivate the DEG mode and switch to either radians or gradients mode depending on your preference. Make sure to press the "AC" button to exit the mode setting and return to the main calculator screen. **

To deactivate the DEG mode on the Casio fx-991DE Plus, you need to press the "MODE" button, then select the "Angle" option by pressing the corresponding number key. Next, choose either "Rad" for radians or "Grad" for gradians using the number keys. Finally, press the "AC/on" button to exit the mode selection and return to the main calculator screen with the DEG mode deactivated. **

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You need to set the calculator to DEG mode when working with angles measured in degrees, such as in most everyday situations. On the other hand, you need to set the calculator to RAD mode when working with angles measured in radians, which is common in more advanced mathematical and scientific contexts. It's important to make sure the calculator is set to the correct mode to accurately plot trigonometric functions. **