It could represent a point whose coordinates do satisfy the requirements of the function.
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Assuming you mean "derivative", I believe it really depends on the function. In the general case, there is no guarantee that the first derivative is piecewise continuous, or that it is even defined.
increase the surface area of a solid means to increase the area of solid
The're supposed to represent 1969. The're supposed to represent 1969. The're supposed to represent 1969.
Neither. Solid can be the least flexible or the most rigid.
a is used as a symbol to represent a variable.