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yes, because obviously you know how
Which property is demonstrated below? If t=s then s=t
You use substitution when you can solve for one variable in terms of the others. By substituting, you remove one variable from the equation, which can then be solved. Once you solve for one variable, you can use substitution to find the other.
in math
There are no universal rules. However, there are a number of situations : quadratic functions and their square roots for which trigonometric substitutions are effective.