CASCALC89 COMMAND · NOT ON THE TI-89
normalLine(
Returns the equation of the normal line to the graph of an expression at a point, the line perpendicular to the tangent.
Syntax
normalLine(expr, var, point)
- Group
- Calculus
- Arguments
- Takes the expression, the variable and the point.
- Availability
- Included
- Origin
- TI-Nspire CAS style command; the TI-89 Titanium handheld does not have it
Example
| Input | Result |
|---|---|
| normalLine(x^2,x,1) | −x/2+3/2 |
Typing normalLine(x^2,x,1) on the home screen and pressing ENTER returns −x/2+3/2.
Related commands
- rk23(Solves a differential equation numerically with an adaptive Runge Kutta method and returns a matrix with the variable values in the first row and the solution values in the second.
- series(Returns a power series expansion of an expression up to a given order.
- tangentLine(Returns the equation of the tangent line to the graph of an expression at a point.
- taylor(Returns the Taylor polynomial of an expression up to a given order, around 0 or around a chosen point.
- Π(Computes the product of an expression as the variable runs from a lower to an upper value.
- Σ(Computes the sum of an expression as the variable runs from a lower to an upper value.
- ∫(Integrates an expression with respect to a variable.
- arcLen(Returns the arc length of the graph of an expression between two values of the variable.