They can be taken at the same time.
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Precalculus is supposed to be a stringent and comprehensive review of both algebra and trigonometry. This is in preparation for calculus which uses both algebra and trig extensively.
yes. as the name implies, pre-calculus is essential in Calculus. Much of the trigonometry and the ideas will carry into the carious Calculus classes.
It's a high school/college class wherein you learn about functions, trigonometry, advanced algebra, and many other things in preparation. See Wikipedia for more info.
Trigonometry isn't required to learn calculus, but it does help you to understand some of the concepts. Geometry, however, is usually required before taking a course in trigonometry.
Well, if Edward Cullen the bloodsucking vampire can use trigonometry. Then I am asuming farmers can as well.