PROBLEM TO BE SOLVED: To decide whether or not the intersection of the maximum value of a function equation and another function equation, etc., has a correct value judging from coordinate values obtained by tracing dots including the intersection by making it possible to confirm the intersection on a graph when the function equation is traced. ;SOLUTION: Assuming that X begins with 38°, a function equation Y1=sinX is traced normally by one dot (converted to an angle of 4°) about an X axis. A display of the tracing state by a cursor is made on the graph at 38° (A), 42° (B), and 46° (D), i.e., equal intervals of 4°. To confirm the intersection with Y2=cosX, the dot indicating the intersection is at the same position with a dot indicating 46° through correctly at 45° and then misread, so when there is the intersection between those display dots, the tracing interval is made more precise than the display intervals and the tracing result is reflected (C) on changes of the cursor shape display, etc.;COPYRIGHT: (C)1997,JPO
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