Precalculus CLEP Review Problems

This video talks about what topics are covered in the Precalculus CLEP exams. It goes through an example problem from each section. This CLEP involves algebra and trigonometric functions. Sometimes those two are brought together in one problem. You should be familar with solve equations and inequalities, solving systems of non-linear equations, functions, inverse functions, transformations, geometry, trigonometric functions and their inverses, and trig identities.

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[TayBeastDestroyerOfWorlds]

Stupid question but on the secant asymptote one, why did you pick pi/2 and not 3pi/2? Is it just because it is the smallest positive value where cos = 0? Thank you