It Becomes Difficult
Confusion loading for a real analyst who thinks that almost every calculation could be solved by using the calculator. However, he discovers that a vital point in his calculation, the epsilon-delta button, is missing his calculator.
The picture shows that the analyst becomes very sad and frustrated, realizing that they cannot solve this issue without that button. This is the case with many scientists/analyst who needs the aid of advanced calculators but doesn’t have it primarily due to buying the wrong calculator for their needs.