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PSTricks provides a number of built in functions to enable the quick creation of figures, graphs and diagrams in LaTeX. Here we see how to use the built in command for drawing a circle.
Original source: http://www.thelazymathematician.com/p/pstricks-examples.html
Following on from example 4 which showed how to plot the graph of a function in LaTeX using pstricks, here we extend the example to show how trig functions such as cos, sin and tan can be plotted.
Original source: http://www.thelazymathematician.com/p/pstricks-examples.html