Dr Barker

@UCU8Nm_HV-GouPa-WmujPltQ - 29.7K subscribers

Fun maths videos, covering lots of topics that I find interesting.

Home Videos Live Playlists

A Short Algebra Problem

A Short Algebra Problem Dr Barker

6.3K views - 6 days ago

This Calculus Problem Looks Impossible

This Calculus Problem Looks Impossible Dr Barker

5.1K views - 1 week ago

This Identity Feels Wrong

This Identity Feels Wrong Dr Barker

8.5K views - 2 weeks ago

A Beautiful Proof of a Beautiful Inequality

A Beautiful Proof of a Beautiful Inequality Dr Barker

7.1K views - 3 weeks ago

Sum of cos(kπ/4)/2^k using Complex Numbers

Sum of cos(kπ/4)/2^k using Complex Numbers Dr Barker

2.4K views - 1 month ago

Can x^x^2 have an Inverse Function?

Can x^x^2 have an Inverse Function? Dr Barker

8.2K views - 1 month ago

3 Proofs of Vandermonde's Identity

3 Proofs of Vandermonde's Identity Dr Barker

2.9K views - 1 month ago

Can You Split an Obtuse Triangle into Acute Triangles?

Can You Split an Obtuse Triangle into Acute Triangles? Dr Barker

3.2K views - 1 month ago

How Many Real Solutions Problem (Plus a Proof of Descartes' Rule of Signs)

How Many Real Solutions Problem (Plus a Proof of Descartes' Rule of Signs) Dr Barker

15.7K views - 1 month ago

A Functional Equation Problem

A Functional Equation Problem Dr Barker

5.5K views - 1 month ago

Vector Triple Product Expansion Geometric Proof (BAC-CAB Identity)

Vector Triple Product Expansion Geometric Proof (BAC-CAB Identity) Dr Barker

2.8K views - 1 month ago

Multiple angle formula for tan

Multiple angle formula for tan Dr Barker

3.1K views - 1 month ago

Beyond the Change of Base Formula

Beyond the Change of Base Formula Dr Barker

2.7K views - 3 months ago

A Double Series Problem

A Double Series Problem Dr Barker

3.5K views - 3 months ago

Use Algebra, NOT a Calculator!

Use Algebra, NOT a Calculator! Dr Barker

3.8K views - 3 months ago

Is 2026 Trigonometrically Interesting?

Is 2026 Trigonometrically Interesting? Dr Barker

3.6K views - 3 months ago

A Function with no Minimum. Should we be surprised?

A Function with no Minimum. Should we be surprised? Dr Barker

14.6K views - 3 months ago

Volume of a Pyramid: An Unusual Proof Using Probability

Volume of a Pyramid: An Unusual Proof Using Probability Dr Barker

6.6K views - 4 months ago

There's Something Wrong With How We're Taught Integration By Parts

There's Something Wrong With How We're Taught Integration By Parts Dr Barker

18.3K views - 4 months ago

Continued Fractions for Square Roots

Continued Fractions for Square Roots Dr Barker

7.6K views - 4 months ago

Laws of Logarithms Via Integral Definition

Laws of Logarithms Via Integral Definition Dr Barker

5K views - 4 months ago

A Crazy Simultaneous Equations Problem: Find all Positive Solutions

A Crazy Simultaneous Equations Problem: Find all Positive Solutions Dr Barker

3.8K views - 5 months ago

Negative Powers of 2 & 5

Negative Powers of 2 & 5 Dr Barker

5.2K views - 5 months ago

A Number Pyramid Puzzle

A Number Pyramid Puzzle Dr Barker

5.8K views - 5 months ago

My New Favourite Number

My New Favourite Number Dr Barker

28.6K views - 5 months ago

Complex Continued Fraction Equation

Complex Continued Fraction Equation Dr Barker

7.1K views - 5 months ago

Product of all Factors of any Number

Product of all Factors of any Number Dr Barker

6.7K views - 6 months ago

Volume of Spherical Caps & Sectors

Volume of Spherical Caps & Sectors Dr Barker

4K views - 6 months ago

A Recursive Sequence Problem

A Recursive Sequence Problem Dr Barker

15.7K views - 6 months ago

Every Type of Mean Explained in 1 Formula

Every Type of Mean Explained in 1 Formula Dr Barker

24.4K views - 6 months ago

A Short Factorisation Problem

A Short Factorisation Problem Dr Barker

8.9K views - 7 months ago

Counting Surjections ("onto" functions)

Counting Surjections ("onto" functions) Dr Barker

3.2K views - 7 months ago

A Functional Inequality

A Functional Inequality Dr Barker

6.3K views - 7 months ago

Finding the Coefficient of x^98 in a Product

Finding the Coefficient of x^98 in a Product Dr Barker

3.1K views - 7 months ago

Inverse Cosine of Complex Numbers

Inverse Cosine of Complex Numbers Dr Barker

4.3K views - 8 months ago

Intro to the Lambert W Function: Can you find ALL real solutions?

Intro to the Lambert W Function: Can you find ALL real solutions? Dr Barker

4.9K views - 8 months ago

How is this real?

How is this real? Dr Barker

4K views - 8 months ago

How many digits does 175^60 have?

How many digits does 175^60 have? Dr Barker

5.8K views - 8 months ago

What are Triangular Roots?

What are Triangular Roots? Dr Barker

100.5K views - 8 months ago

Solving a Cubic Exponential Equation with Different Bases

Solving a Cubic Exponential Equation with Different Bases Dr Barker

4K views - 9 months ago

A Periodic Functional Equation

A Periodic Functional Equation Dr Barker

6.2K views - 9 months ago

A Short Proof by Contradiction

A Short Proof by Contradiction Dr Barker

45.8K views - 9 months ago

A Tricky Roots of Cubics Problem

A Tricky Roots of Cubics Problem Dr Barker

3.4K views - 9 months ago

A Trick For Differential Equations | 2nd Order Integrating Factor

A Trick For Differential Equations | 2nd Order Integrating Factor Dr Barker

3.9K views - 10 months ago

An Equation with a Surprisingly Simple Solution

An Equation with a Surprisingly Simple Solution Dr Barker

4.2K views - 10 months ago

Every Mathematician Should Learn This: atan2 Function

Every Mathematician Should Learn This: atan2 Function Dr Barker

13.7K views - 10 months ago

Solving an Equation with Logs

Solving an Equation with Logs Dr Barker

9.3K views - 10 months ago

A Calculus Problem with a Twist

A Calculus Problem with a Twist Dr Barker

4.2K views - 11 months ago

Elementary Row Operations & Determinants

Elementary Row Operations & Determinants Dr Barker

2.8K views - 11 months ago

Equation of a Circle in 3D

Equation of a Circle in 3D Dr Barker

7.7K views - 11 months ago

Messing Around With Nested Roots

Messing Around With Nested Roots Dr Barker

4.4K views - 11 months ago

A Ridiculous Approximation

A Ridiculous Approximation Dr Barker

23.4K views - 11 months ago

When It Doesn't Matter If You Use Degrees or Radians

When It Doesn't Matter If You Use Degrees or Radians Dr Barker

3.6K views - 1 year ago

Fibonacci meets Pythagoras

Fibonacci meets Pythagoras Dr Barker

6.9K views - 1 year ago

A Short Simultaneous Equations Problem

A Short Simultaneous Equations Problem Dr Barker

11.2K views - 1 year ago

New Trig Identity Just Dropped!

New Trig Identity Just Dropped! Dr Barker

10.9K views - 1 year ago

A Surprisingly Complex Functional Equation

A Surprisingly Complex Functional Equation Dr Barker

7K views - 1 year ago

Proof With Complex Numbers | Harmonic Addition Theorem

Proof With Complex Numbers | Harmonic Addition Theorem Dr Barker

3.6K views - 1 year ago

Nested Probability Problem

Nested Probability Problem Dr Barker

3.9K views - 1 year ago

Determining the Speed of a Fixed-Point Iteration

Determining the Speed of a Fixed-Point Iteration Dr Barker

5K views - 1 year ago