Trigonometric Operations

You can use the calculator to perform operations involving the most commonly used trigonometric functions and set it to display the results in either degrees, radians, or grads.

Selecting the Angle Units

When you turn the calculator on, you can enter angles in the angle units last selected. The results of any angle calculations are also displayed in these angle units.

The key sequence [ 2nd ] [ DRG ] changes the angle units. Each time you press this key sequence, the calculator rotates to the next unit. The rotation sequence is degrees, radians, grads, and then degrees again. You can press [ INV ] [ 2nd ] [ DRG ] at any time and return to degree units. A status indicator in the display shows the units you have selected.

Changing the angle units does not convert a number in the display. You can use angle conversions, described in "Angle Conversions" in the section on "Conversions", to convert a number in the display without changing angle modes.

Available Trigonometric Functions

The list below shows the trigonometric functions available on the calculator and the keys you press to obtain them. All are immediate functions.

Trig Function : Key

Sine : [ SIN ]

Cosine : [ COS ]

Tangent : [ TAN ]

Arcsine : [ INV ] [ SIN ]

Arccosine : [ INV ] [ COS ]

Arctangent : [ INV ] [ TAN ]

Example

In the following example, calculate the cosine of 35° and the arccosine of the result to illustrate the operation of the trigonometric functions.

Procedure	Press	Display
Clear display	[ CLEAR ]
Select degree mode	[ INV ] [ 2nd ] [ DRG ]
Enter the number	35
Calculate the cosine	[ COS ]
Calculate the arccosine of the result	[ INV ] [ COS ]