Lets you easily create, edit and manipulate mathematical expressions. Merlyn is an equation editor for algebra, trigonometry and calculus. It lets you visually create documents that resemble the pages of a textbook.Merlyn allows you to manipulate equations in a step-by-step fashion. If you look at any problem that's been done step by step in a textbook, the difference between one step and the next is that some part of the expression has been rearranged, simplified, canceled, and so on. This is just what Merlyn does. You select the part of the expression you want to change and then you tell the program what change you want. You apply commands like simplify, cancel, commute, etc., and the expression changes accordingly. If there is more than one possibility you're offered a list of options. Pick the one you want and the result appears in your document.