HP 33s hp 33s_user's manual_English_E_HDPM20PIE56.pdf - Page 69
Programming Note, Sets Radians mode
UPC - 082916001456
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Example: Show that cosine (5/7)π radians and cosine 128.57° are equal (to four significant digits). Keys: Display: Description: {} 5 7 |NzR {} 128.57 R ) . ) Sets Radians mode; RAD annunciator on. 5/7 in decimal format. Cos (5/7)π. Switches to Degrees mode (no annunciator). Calculates cos 128.57°, which is the same as cos (5/7)π. Programming Note: Equations using inverse trigonometric functions to determine an angle θ, often look something like this: θ = arctan (y/x). If x = 0, then y/x is undefined, resulting in the error For a program, then, it would be more reliable to determine θ by a rectangular to polar conversion, which converts (x,y) to (r,θ). See "Coordinate Conversions" later in this chapter. Real-Number Functions 4-5
Real–Number Functions
4–5
Example:
Show that cosine (5/7)
π
radians and cosine 128.57° are equal (to four significant
digits).
Keys:
Display:
Description:
{
}
Sets Radians mode;
RAD
annunciator on.
5
7
5/7 in decimal format.
Cos (5/7)
π
.
{
}
Switches to Degrees mode (no
annunciator).
128.57
Calculates cos 128.57°, which
is the same as cos (5/7)
π
.
Programming Note:
Equations using inverse trigonometric functions to determine an angle
θ
, often look
something like this:
θ
= arctan (
y
/
x
).
If
x
= 0, then
y
/
x
is undefined, resulting in the error:
. For a program,
then, it would be more reliable to determine
θ
by
a rectangular to polar conversion,
which converts (
x,y
) to (
r
,
θ
). See "Coordinate Conversions" later in this chapter.