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📓 Interactive Notebook: https://ludium.ai/courses/calculus-1/... Ever simplified a function and thought you fixed its domain? Think again. This video reveals why algebraic simplification is cosmetic, not corrective—and how to avoid losing points on exams by falling for the simplification trap. You'll learn the systematic sign analysis method for finding domains of square root functions with quadratic expressions, and master the two main "domain breakers" that restrict valid inputs. 📚 Key concepts covered: • The two domain breakers: division by zero (vertical asymptotes) and square roots of negative numbers • Sign analysis method: factor, find zeros, test intervals, select valid regions • Why you can't solve factor inequalities separately (the product of two negatives is positive!) • Domain notation with brackets vs. parentheses • Trigonometric domain restrictions (tangent function) • The golden rule: simplification can never remove domain restrictions ⏱️ Perfect for precalculus and calculus students preparing for exams. ───────────────────────────── 📖 ORIGINAL SOURCE This video distills concepts from a longer lecture. Original: • Calculus 1 Lecture 0.2: Introduction to F... Full credit to the original creator for the educational content. ───────────────────────────── 📺 About Lecture Distilled Long lectures. Short videos. Core insights. We transform lengthy academic lectures into focused concept videos that respect your time while preserving the depth you need. Each video targets one core question and delivers clear, exam-ready understanding. 🔗 GitHub: https://github.com/Augustinus12835/au... ───────────────────────────── #DomainOfFunctions #SignAnalysis #Precalculus #MathHelp #SquareRootFunctions #DivisionByZero #Calculus #MathTutorial