Casio ALGEBRA FX 2.0 Function Manual page 15

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