If they are present in the expression you need to use them to evaluate the expression, if they are not, you don't.
You would not use any of them - at least not explicitly - to evaluate sqrt[ln(pi)], for example.
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It is used in evaluating almost all mathematical expressions. The only exceptions are ones which involve only addition and subtraction, or only multiplication and division, or are so trivial that the are expressed in BODMAS order.
Addition is the inverse of Subtraction. Division is the inverse of Multiplication. and then visa-versa. :-) Addition is the inverse of Subtraction. Division is the inverse of Multiplication. and then visa-versa. :-) the Answer is subtraction
In Algebraic and even simple mathematical operations, convention to determines the order of calculations. This order is commonly remembered by the acronym PEMDAS, which stands for (and indicates the order of) parenthesis, exponents, multiplication, division, addition and subtraction.
the inverse of addition is subtraction and the inverse of multiplication is division. Of course, multiplication is just repeated addition so division is just repeated subtraction!
? An expression which is obtained by performing a finite number of the following operations on symbols representing numbers: addition, subtraction, multiplication, division, raising to a power.