HP 39gII

166 Using mathematical functions
student_cdf Cumulative student's t distribution function. Returns the
lower-tail probability of the student's t probability density
function at x, given n degrees of freedom.
student_cdf(n, x)
Example:
student_cdf(3, –3.2) returns
0.0246659214813.
student_icdf Inverse cumulative student's t distribution function. Returns
the value x such that the student's-t lower-tail probability
of x, with n degrees of freedom, is p.
student_icdf(n, p)
Example:
student_icdf(3, 0.0246659214813) returns 3.2.
Hyperbolic trigonometry
The hyperbolic trigonometry functions can also take
complex numbers as arguments.
ACOSH Inverse hyperbolic cosine : cosh
–1
x.
ACOSH(value)
ASINH Inverse hyperbolic sine : sinh
–1
x.
ASINH(value)
ATANH Inverse hyperbolic tangent : tanh
–1
x.
ATANH(value)
COSH Hyperbolic cosine
COSH(value)
SINH Hyperbolic sine.
SINH(value)
TANH Hyperbolic tangent.
TANH(value)
ALOG Antilogarithm (exponential). This is more accurate than
10^x due to limitations of the power function.
ALOG(value)