The angular mode buttons (, , and ) specify whether angles are measured in degrees, radians, or grads. The RAD and GRAD indicators are displayed to indicate those modes, while the absence of these indicators implies degrees mode.

The following functions modify the number in the x register:

calculates the sine of x.

calculates the cosine of x.

calculates the tangent of x.

calculates the arc sine of x.

calculates the arc cosine of x.

calculates the arc tangent of x.

Pressing before any of the above functions accesses the hyperbolic functions. The button recalls the value of pi into the x register.