Setting The Angular Mode; Trigonometric Functions - HP 33s User Manual

Setting the Angular Mode

The angular mode specifies which unit of measure to assume for angles used in
trigonometric functions. The mode does not convert numbers already present (see
"Conversion Functions" later in this chapter).
360 degrees = 2 radians = 400 grads
To set an angular mode, press
can select an option.
Option
{  } Sets Degrees mode (DEG). Uses decimal
degrees, not degrees, minutes, and
seconds.
{  } Sets Radians mode (RAD).
{  } Sets Grads mode (GRAD).

Trigonometric Functions

With x in the display:
Sine of x .
Cosine of x .
Tangent of x .
Arc sine of x .
Arc cosine of x .
Arc tangent of x .
Calculations with the irrational number
Note
exactly by the 12–digit internal precision of the calculator. This is
particularly noticeable in trigonometry. For example, the calculated
sin
number close to zero.
4–4
Real–Number Functions
Ý
. A menu will be displayed from which you
Description
To Calculate:
(radians) is not zero but –2.0676
Annunciator
none
RAD
GRAD
Press:
k
n
q
¹ i
¹ l
¹ o
cannot be expressed
–13
10 , a very small