Texas Instruments TI-89 and TI-92 Plus Computer 
Last page update: Sunday, November 21, 1999 
 
Standard Linear Approximation, Multivariable - for the TI-89 and TI-92 Plus
Version 1.1   (Sunday, November 07, 1999)
Download [ LL.89f  | LL.9xf ] (620 bytes)
Description Determines the standard linear approximation of a function at a point.  
1.1- Fixed invalid function reference.
Screen shots
Screen image 
Documentation Usage: 
LL(Expr,VarOrList,NumOrList) 

Expr: The expression to approximate. 

VarOrList: The independant variable or variable list. 

NumOrList: The point with values corresponding to VarOrList. 

Note: LL() is capitalized in this document because the lower case l [ll()] is ambiguous in some fonts (looks like a numeral 1). 

Return value: 
The standard linear approximation of the function at the specified point. 

Examples: 
1. LL(5x2-6x+2,x,0) 
    -6x+2 

2. LL(x3-x+y2,{x,y},{1,1}) 
     2x+2y-3 

3. LL(x3-x+y2z2,{x,y,z},{1,1,1}) 
     2x+2y+2z-5