19990401
u tanLine (tanLin)
Function: Returns the expression for a tangent line.
Syntax: tanLine( Exp, variable, variable value at point of tangency [ ) ]
Example To determine the expression for a line tangent with X
3
when X = 2
2(CALC)i(tanLin)vMd,v,cw 12X – 16
u denominator (den)
Function: Extracts the denominator of a fraction.
Syntax: denominator( Exp [ ) ]
Example To extract the denominator of the fraction (X + 2)/(Y – 1)
2(CALC)j(EXTRCT)b(den)
(a+(X)+c)/(a-(Y)-bw Y – 1
u numerator (num)
Function: Extracts the numerator of a fraction.
Syntax: numerator( Exp [ ) ]
Example To extract the numerator of the fraction (X + 2)/(Y – 1)
2(CALC)j(EXTRCT)c(num)
(a+(X)+c)/(a-(Y)-bw X + 2
u gcd
Function: Returns the greatest common denominator.
Syntax: gcd( Exp, Exp [ ) ]
Example To determine the greatest common denominator of X + 1 and X
2
– 3X – 4
2(CALC)v(gcd)v+b,vx-
dv-ew X + 1
7-1-14
Using the CAS (Computer Algebra System) Mode
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