# Tchebycheff; Tcollect; Tdelta; Tests - HP 48gII Advanced User's Reference Manual

Graphing calculator.

The polynomial is calculated at the point global = 0. The expression symb may have a removable
singularity at 0. The order, n, is the relative order of the Taylor polynomial–the difference in order
between the largest and smallest power of global in the polynomial.
TAYLR always returns a symbolic result, regardless of the state of the Numeric Results flag (–3).
Access:
Input/Output:

## TCHEBYCHEFF

CAS:
Return the nth Tchebycheff polynomial.

### TCOLLECT

CAS:
Linearize products in trig expression by collecting and combining sine and cosine terms.

### TDELTA

Type:
Function
Description: Temperature Delta Function: Calculates a temperature change.
TDELTA subtracts two points on a temperature scale, yielding a temperature increment (not an
actual temperature). x or x_unit1 is the final temperature, and y or y_unit2 is the initial
temperature. If unit objects are given, the increment is returned as a unit object with the same
units as x_unit1. If real numbers are given, the increment is returned as a real number.
...µ
Access:
Flags:
Numerical Results (-3)
Input/Output:
TINC

### TESTS

CAS:
Display menu or list with tests that work in algebraic expressions, and ASSUME and
UNASSUME.

### TEVAL

Type:
Function
Description: For the specified operation, performs the same function as EVAL, and returns the time taken to
perform the evaluation as well as the result.
...µ
Access:
Input/Output:
EVAL
3-182 Full Command and Function Reference
&
LIMITS
SERIES TAYLR
Level 3/Argument 1
Level 2/Argument 2
'symb'
TDELTA
Level 2/Argument 1
Level 1/Argument 2
x
x_unit1
x_unit
'symb'
'symb
'
1
TEVAL
Level 1/Argument 1
Object
( Öis the left-shift of the 4key).
Level 1/Argument 3
'global'
n
order
y
x_unit2
'symb'
y_unit
'symb
'
2
Level 2/Item 2
result
Level 1/Item 1
'symb
Taylor
Level 1/Item 1
x
delta
x_unit1
delta
'TDELTA(x_unit, symb)'
'TDELTA(symb, y_unit)'
'TDELTA(symb
, symb
)'
1
2
Level 1/Item 1
time taken
'