XO Math

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Welcome to XO Math! Calm. Clear. Step-by-step. This channel features instructional videos in Algebra, Trigonometry, Precalculus, and Calculus I & II with pla...

Latest Videos

Introduction to Differential Equations Solutions, Initial Conditions, and Initial Value Problems

Gabriel's Horn Paradox Finite Volume but Infinite Surface Area

Surface Area of Revolution Rotating Curves Around the X and Y Axis

Arc Length in Calculus Algebra-Heavy Examples Made Clear

Arc Length Formula Calculus Examples and Where the Formula Comes From

Calculus with Parametric Equations Derivatives, Tangent Lines, Area, Arc Length, and Surface Area

Introduction to Parametric Equations Explained Step by Step with Examples

Arc Length of a Polar Curve – Formula, Proof Idea, & Cardioid Example Calculus 2 Polar Coordinates

Polar Area Cardioid, Rose Curves, and Intersecting Regions

Polar Derivatives Explained (dydx, Horizontal and Vertical Tangents)

Graphing Polar Equations Cardioids, Limacons, & Rose Curves

Introduction to Polar Coordinates Graphing Polar Points, Regions, and Converting to Rectangular

Taylor and Maclaurin Series Evaluate Limits & Integrals (Step-by-Step)

Taylor Series for ln(x − 1) + Interval of Convergence (Full Example)

Limit Comparison Test Explained (When and How to Use It)

Direct Comparison Test (DCT) for Infinite Series How to Choose a Helpful Comparison

Interval of Convergence Explained Ratio Test, Geometric Series, & Radius of Convergence Calculus 2

Radius and Interval of Convergence of Power Series (Geometric Series, Ratio Test, Root Test)

Left, Right, and Midpoint Sums (Rectangular Approximation Method)

Pumping Liquid Work Problems in Calculus 2 Applications of Integrals (Tanks, Pools, Cones)

Work Done Lifting Objects Calculus 2 Rope Problems, Variable Force Integrals, and Work Applications

Work and Spring Problems in Calculus Hooke’s Law, Variable Force Integrals, and Unit Conversions

Disk Method for Volumes of Solids of Revolution Calculus Explained Step by Step

Telescoping Series Explained Step by Step Convergence, Partial Sums, and Limits

Implicit Differentiation Made Easy (Hard Example Step-by-Step)

Limit of a Riemann Sum Step by Step Examples

Separable Differential Equations Explained Step by Step with Multiple Examples

Area Between Curves dy When to integrate with Respect to y

Writing Equations from 3D Diagrams Lines and Curves in Calculus

Building a Mathematical Model for Optimization Rectangle Inscribed in a Circle Step by Step