"Science, in the broadest sense, refers to any system of knowledge which attempts to model objective reality. In a more restricted sense, science refers to a system of acquiring knowledge based on the scientific method, as well as to the organized body of knowledge gained through such research."
en.wikipedia.org/wiki/Science The Greeks formalized Science as being a method of acquiring knowledge about the world using logic, experiment and measurement. The procedure of acquiring knowledge was refined over centuries and is today called the scientific method.
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You use the output of the first function as the input of the second function. For example, if your functions are sin() (the sine function) and root() (the square root function), you can combine them as:sin(root(x)) or: root(sin(x))
yes
Yes, if your equation is f(x) = sqrt5(x). The square root is also a function itself, if that's what you mean.
electricians use the Square Root function when connecting 3 way outlets with the electral current of an intel processor.
Yes, but in this case, the coefficients of the polynomial can not all be real.