activities are done for fun and functions are things you have to do
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Predefined functions are functions that have been written and we can use them in our C++ statements. But we must know how to use each of these predefined functions.
They are different trigonometric functions!
A function is a relation whose mapping is a bijection.
In mathematics the difference between a function and a relation is that each X-value in a function only has a single Y-value.