Maths Worksheets

• Create, edit, print and save interactive mathematical worksheets
• Format mathematical expressions, text, graphic images, and OLE objects
• Open multiple worksheets, 2D, and 3D plot windows
• Cut, copy and paste objects between worksheets
• Customise print headers and footers and print preview
• Write worksheets in Rich Text Format
• Load and analyze numeric data files
• Generate C, Fortran, Pascal, and Basic program files

Expression Entry

• Easy linear entry and editing of expressions
• Enter Greek variables and mathematical symbols using dockable toolbars
• 2D matrix entry and editing
• Templates for common Algebra and Calculus functions
• Expressions displayed using standard mathematical notation
• View the elapsed time and memory used during long computations
• Subexpression highlighting, extraction and substitution
• Move and automatically renumber expressions
• Communicate with TI CAS calculators: import data from and export data to TI-89, TI-92+, Voyage 200 calculators
• Customise menus, toolbars and shortcut keys
• Optional multi-line editing
• Fully scaleable Derive Unicode font
• State variables saved in DfW files
• Parentheses matching

Plot Windows

• Plot space curves and complex-valued functions
• Trace plots with moveable cross
• Plot data points and Boolean combinations of surfaces
• Zoom in or out, or use automatic scaling
• Specify plot colors and aspect ratio
• Annotate plots, number and label axes
• Embed plots into math worksheet or export as a TIFF, JPEG or BMP
• Print plots in colour or black & white

2D Plots

• Explicit, implicit, and parametric plots
• Plot using rectangular or polar coordinates
• Specify plot range using a "zoom" box
• Plot real and imaginary parts
• Make plots dynamic: animate expression plots with slider bars
• Let plots be labelled with defining equations

3D Plots

• Plot surfaces in rectangular, cylindrical and spherical coordinates
• Rotate one or more plots in real time with the mouse or direction controls
• Make plots dynamic: animate expression plots with slider bars
• Let plots be labelled with defining equations
• Controllable display of 3D mesh lines
• Controllable point size of 3D data-point plots

Arithmetic

• Exact rational arithmetic with no roundoff error
• Adjustable precision approximate arithmetic
• Rational, decimal, and scientific notation
• Decimal, hexadecimal, octal, or binary arithmetic
• Real, imaginary, complex, and infinite numbers
• Prime number recognizers and generators
• Efficiently factors large integers
• Functions for gcds, lcms, and mods
• Pseudo-random number generator

Algebra

• Expand and factor polynomials
• Partial fraction expansion of rational functions
• Simplify expressions using powerful identities
• Solve equations and inequalities exactly or numerically
• Solve systems of polynomial equations, linear and nonlinear
• Exponential, trigonometric, and hyperbolic functions
• Specify angles in degrees or radians
• Piecewise-continuous functions
• Riemann zeta, gamma, and error functions
• Probability, statistics, and financial functions
• Substitute values for variables or subexpressions
• Integer, real, and complex variable declarations
• Define functions and assign variable values
• Number theory utility library

Calculus

• Display the steps in the simplification of an expression with optional display of transformation rules
• Finite and infinite symbolic limits
• First and nth order partial derivatives
• Antiderivatives and definite integrals
• Approximate numerical integration
• Finite and infinite sums and products
• Curvatures, tangents, and osculating circles
• Implicit and parametric differentiation
• Taylor and Fourier series approximations
• Arclengths, areas, and volumes
• Laplace transforms
• Solve first and second order ODEs exactly
• Runge-Kutta approximations for systems of ODEs
• Utility libraries for special functions

Vector, Matrices, and Sets

• Symbolic and numeric elements
• Uses standard subscript notation
• Dot, cross, and outer products
• Transpose, determinant, inverse, and trace
• Matrix reduction to row echelon form
• Eigenvalue and eigenvectors
• Noncommutative vector and matrix algebra
• Differential and integral vector calculus
• Efficient functions for vector and matrix operations
• Least squares curve fitting
• Set union, intersection, and power sets

Programming

• Both functional and multi-line, procedural programming
• Block, loop, and if-then-else control constructs
• Boolean and relational operators for predicates
• Define default initial values for local variables
• Expression type recognizer functions
• Expression component extraction functions
• Map functions over the elements of vectors and sets
• Sort and search the elements of sets and vectors
• Extract and replace elements of vectors using subscripts
• Make variable substitutions serially or in parallel
• String processing functions

Documentation and Support

• Manual with step-by-step visual examples
• Reference guide and improved and extended on-line help
• Free Email support groups
• Training videos on CD-ROM

Derive is no longer available as a separate program, but the Derive code is now incorporated into TI-Nspire CAS software, distributed by Chartwell-Yorke Ltd, 114 High Street, Belmont Village, Bolton, Lancashire, BL7 8AL, UK. Tel +44 (0)1204 811001, fax +44 (0)1204 811008. email info@chartwellyorke.com, www.chartwellyorke.com/ti-nspire