Function Droite: Equation Of A Straight Line - HP 48gII User Manual

The following screen shows that functions EXPM and LNP1 do not apply to
complex numbers. However, functions GAMMA, PSI, and Psi accept complex
numbers:

Function DROITE: equation of a straight line

Function DROITE takes as argument two complex numbers, say, x +iy and
1 1
x +iy , and returns the equation of the straight line, say, y = a+bx, that
2 2
contains the points (x ,y ) and (x ,y ). For example, the line between points
1 1 2 2
A(5,-3) and B(6,2) can be found as follows (example in Algebraic mode):
Function DROITE is found in the command catalog (‚N).
Using EVAL(ANS(1)) simplifies the result to:
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