Casio FX-890P - Page 119

119
asinh()
PURPOSE: Returns the value for which hyperbolic sine (value) = parameter.
FORMAT: double asinh(x) double x;
PARAMETERS: x must be within the ]-5x10
99
, 5x10
99
[ range
EXPLANATION:
1. The mathematical formula for reverse hyperbolic sine is:
asinh(x) = ln ( x + √ ) where ln is the natural logarithm.
2. The returned value is in the [-230.2585092, +230.2585092] range.
SEE: sinh(), log()
atan()
PURPOSE: Returns the angle value for which tangent (angle value) = parameter.
FORMAT: double atan(x) double x;
PARAMETERS: x must be within the [-1x10
100
, +1x10
100
] range.
EXPLANATION:
1. The unit of the returned value is specified using the angle() function.
2. The returned value is in the [-90°, 90°] or [ -π/2, π/2 Radians ] range.
SEE: angle(), tan()
atanh()
PURPOSE: Returns the value for which hyperbolic tangent (value) = parameter.
FORMAT: double atanh(x) double x;
PARAMETERS: x must be within the ]-1, +1[ range
EXPLANATION:
1. The mathematical formula for reverse hyperbolic tangent is:
atanh(x) = ( ln (1+x) – ln (1-x) ) / 2 where ln is the natural logarithm .
2. The returned value is in the ]-10
100
, +10
100
[ range.
SEE: tanh(), log()
cos()
PURPOSE: Returns the value of cosine (parameter).
FORMAT: double cos(x) double x;
PARAMETERS: x must be within the ]-1440°, +1440°[ or [-8π , 8π Radians ] range.
EXPLANATION:
1. The unit of the parameter x is specified using the angle() function.
2. The returned value is in the [-1, 1] range.
SEE: angle(), acos()
x
2
+ 1