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fDesc[0] = "MathGraph <br /> Type any expression and you&#039;ll see the graph. You can choose the x interval (e.g. x=from -1 to 20) and the step. Available functions are :<br /> COS, SIN, SINH, COSH, TAN, COTAN, ARCTAN, ARG,EXP, LN, LOG10, LOG2, LOGN, SQRT, SQR, POWER, INTPOWER,MIN, MAX, ABS, TRUNC, INT, CEIL, FLOOR ,RANDOM and<br /> SIGN (sign(x) is 1 for x&gt;1, 0 for x=0, -1 for x&lt;0),<br /> ZERO (zero(x) is 0 for x=0, 1 for x&lt;&gt;0),<br /> HEAV (heav(x) is =1 for x&gt;0 and =0 for x&lt;=0).";

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