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The next equation also obeys the syntax rules. This equation uses the
inverse function, INV (typed by [1/x]) instead of 1+. Notice that the
sine (SIN) function is "nested" (located inside) the INV function:
P=A+B+HX CINV(SINCT2 > +INV(SINCF 22D
Equation Functions
You can use most of the HP-22S numeric functions in equations. If
the function has arguments, they are enclosed in parentheses; func-
tions requiring two arguments use a colon (:) to separate the two
arguments. (Arguments are the numbers acted upon by functions. For
example, ¥ is the argument in SIN(X >, which calculates the sine of
X.)
The arguments of functions can be constants, variables, algebraic
expressions, and other functions.
The functions are grouped into three categories:
B General math functions.
B Statistics functions.
B Unit conversion functions.
General Math Functions
Function
Description
Typing Aid
ABS(x)
Absolute value.
B(PARTS]
{ABS}
ACOS(x)
Arc cosine.*
B(Acos]
ACOSH(x)
Hyperbolic arc cosine.
B(-vr) B(Acos]
ALOG(x)
Common (base 10) antilogarithm; 10*.
B0
ASIN(x)
Arc sine.*
B(ASIN]
ASINH(x)
Hyperbolic arc sine.
B(rvr] B(ASIN]
ATAN(x)
Arc tangent.*
B(ATAN]
ATANH(x)
Hyperbolic arc tangent.
B(Hvr] B(ATAN]
* Uses the current angular mode—Degrees or Radians.
80
6: Evaluating and Solving Equations
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