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In Precalculus one learns about trigonometry and it explains concepts which are introductions to calculus. Calculus uses the concepts/ syllabi taught in precalculus to develop formulas for processes for finding things like derivatives. Precalculus is also called preparation for calculus.
Proportions are used in real life to determine prices of things.
Precalculus is not something that was invented. It is merely the things about mathematics that you need to know before you can begin the study of calculus.
Believe it or not, school is a real life situation. If you are using it in school it real life for you.
Precalculus and/or calculus.