GeoGebra 4.4.39.0 Description
GeoGebra 4.4.39.0 is a very useful mathematics tool for education in secondary schools, which brings together geometry, algebra and calculus.
GeoGebra 4.4.39.0 is also a dynamic geometry system, meaning you can do constructions with points, segments, vectors, lines, conic sections as well as functions and change them dynamically afterwards.
On the other hand, equations and coordinates can be entered directly. Thus, GeoGebra has the ability to deal with variables for numbers, vectors and points, finds derivatives and integrals of functions and offers commands like Root or Extremum.
These two views are characteristic of GeoGebra: an expression in the algebra window corresponds to an object in the geometry window and vice versa.
Features:
 Captions enabled for all objects
 New option "Force Reflex Angle" forces angles to be between 180 and 360 degrees
 Pressing toggles the focus between the Input Bar and the Graphics View
 Improvements to the way translation works
 Dynamic colors (Properties > Advanced tab). Set a function with range [0,1] for each color component (red, green, blue)
 Option for the grid to be bold
 Thumbnail saved in GGB files.
 Worksheets resized if they were saved on a larger screen
 Isometric grid
 Comparing objects of different types doesn't return an error, can now compare Text and Image objects
 If the Points Export_1 and Export_2 exist, they will be used to define the export rectangle (Export_1 and Export_2 must be within the visible area)
 Checkbox now consistent across all platforms
 Options > Checkbox Size > Regular/Large
 Perpendicular check added to "Relation between two objects" Tool
 Messages from "Relation between two objects" Tool rewritten
 Angular Bisector Command and Tool renamed to Angle Bisector
 Line Bisector Command and Tool renamed to Perpendicular Bisector
 BMP import
 Unicode fonts used in LaTeX equations
 LaTeX equations exported at full resolution
 in SVG and PDF export, option to export text as editable text or shapes. Stores the text either as text (lets you edit the text in eg InkScape) or as bezier curves (ie guaranteed to look the same even if the correct font is not installed).
 support for inline equations and linefeeds in LaTeX eg "if x=9 find $ sqrt{ x } $"
 Angle entered in rotate dialog box is remembered (if it is in degrees)
 Show All Objects in Graphics View menu
 Option for up to 15 decimal places
 x^0, x^1, x^7, x^8, x^9 now displayed nicely
 PGF/TikZ export
 added degree symbol to axes units
 new commandline parameter: antiAliasing=off
 defines e to be the Euler number when used in expressions (unless it has already been defined to something else)
 templates for 2x2 and 3x3 matrix in LaTeX dropdown menu
 Option to display numbers as Significant Figures (3,5,10,15)
 New options Edit > Select Descendents/Select Ancestors
 Doubleclick on an object in the Graphics View opens the redefine dialog, which now has a button to open the Properties dialog as well as 'OK' and 'Apply' buttons
 "Input Field" renamed to "Input Bar"
 "Algebra window" renamed to "Algebra View"
 "Graphics window" renamed to "Graphics View"
 Algorithm to decide which point to select added (rather than popping up a menu)
 Points in the form (a, b), (a + c, b + d) and (a + x(A), b + x(B)) are draggable (the variables a & b are updated accordingly)
 Ctrl + to zoom in, Ctrl  to zoom out
 New menu option "Recompute all Objects (F9)" which updates all the random numbers
 Set point style for lists of points
 Set line style for lists of lines
 Set filling style for lists of eg circles, polygons
 Set text style for lists of texts
 Animation of sliders
 f'(x) is automatically named f'(x) [ ie you can type just f'(x) rather than f'(x) = f'(x) ]
 Shiftright drag will now allow a zoom that allows the aspect ratio to change
 you can now set the line thickness of polygons created with eg Sequence[Polygon[(i,i),(i+1,i),(i+1,i+1)],i,1,3]
 polygons can now have line thickness 0 (ie no edges)
 In Captions, %v is replaced by the value and %n by the name, eg "The value of %n is %v"
 Captions can now be surrounded by
... or
... to get bold or italic
 Altclick or F3: copy definition of selected object to the Input Bar
 F4: copy value of selected object to the Input Bar
 F5: copy name of selected object to the Input Bar
 Altscroll wheel: accelerated zoom
 Altdragging a selection rectangle puts a list of the objects selected in the Input Bar
 Hold down Alt when drawing a Line, Segment, Ray or Vector forces the angle to be a multiple of 15 degrees
 File > Open shows a preview image when available
 Properties > Color shows the color as an RGB triple in the preview pane eg (0,0,255)
 Area[Arc], Perimeter[Arc] work (treating the arc as a segment)
 sin(├ÅÔé¼ x) now prints the ├ÅÔé¼ nicely
 Objects are now redefined from the input bar eg A = Point[f] then A = (1,2) will now make A a free object
 Shiftdoubleclick on a point on line/circle/function/etc in the Algebra View will allow you to set the coordinates without redefining it
 Record to Spreadsheet Tool: you can now altclick on a Point, Vector or Number to have its value(s) copied into columns A and B

replaced by newline in texts eg Text["GeoGebra
Rocks",(3,4)]
 can't have functions called sin, cos etc
 New point styles (plus, diamond, triangles)
 Size of the drawing pad in pixels can be obtained with pixelsWidth = x(Corner[5]) and pixelsHeight = y(Corner[5])
 Export to Google Gadget and MediaWiki