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blackpenredpen

blackpenredpen

@blackpenredpen

2.4K

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#9,857

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#40,904

Global Rank

2.4K

Video Count

230.6M

Video View

1.4M

Subscriber

#9,857

United States Rank

#40,904

Global Rank

Overview Videos Outliers Statistics Similar Channels Timeline Retention Analytics About

Finding the volume of a 4d sphere

Finding the volume of a 4d sphere

My first triple improper integral!

My first triple improper integral!

This calculus proof is only for math majors (National Taiwan University entrance exam)

This calculus proof is only for math majors (National Taiwan University entrance exam)

Can x factorial = 0?

Can x factorial = 0?

I made a volume of revolution problem "MORE FUN"

I made a volume of revolution problem "MORE FUN"

The first calculus question on a National Taiwan University entrance exam (for transfers)

The first calculus question on a National Taiwan University entrance exam (for transfers)

A taste of calculus 1 problems for math majors!

A taste of calculus 1 problems for math majors!

Brilliant minimum problem

Brilliant minimum problem

I created this double integral, am I the next Gauss?

I created this double integral, am I the next Gauss?

Why do mathematicians think disc=square?

Why do mathematicians think disc=square?

How to welcome a math PhD friend at the airport! @drpeyam

How to welcome a math PhD friend at the airport! @drpeyam

THIS LIMIT IS WRONG but how do we prove it?

THIS LIMIT IS WRONG but how do we prove it?

Can f'(x)=f^-1(x)?

Can f'(x)=f^-1(x)?

Only math majors would do this! (epsilon-delta proof for a simple limit)

Only math majors would do this! (epsilon-delta proof for a simple limit)

How to find a delta for a specific epsilon (epsilon-delta definition of a limit)

How to find a delta for a specific epsilon (epsilon-delta definition of a limit)

Epsilon-delta proof without THAT TRICK!

Epsilon-delta proof without THAT TRICK!

Brilliant Trig Identity Challenge!

Brilliant Trig Identity Challenge!

That chain rule joke!

That chain rule joke!

Trying my first abstract algebra problem in 14 years!

Trying my first abstract algebra problem in 14 years!

Why are integrals SO HARD? (My 5 reasons and how to prepare for integrals)

Why are integrals SO HARD? (My 5 reasons and how to prepare for integrals)

I’m sorry, I have been saying “let x=1” wrong for 13 years

I’m sorry, I have been saying “let x=1” wrong for 13 years

Can x^y=yx?

Can x^y=yx?

The square root of the 2 by 2 zero matrix

The square root of the 2 by 2 zero matrix

Calculus students don’t use these inequalities anymore!

Calculus students don’t use these inequalities anymore!

Factoring a trinomial (what I learned in Taiwan vs in US)

Factoring a trinomial (what I learned in Taiwan vs in US)

Here's how I would solve this high school math question without calculus (finding extrema of trig)

Here's how I would solve this high school math question without calculus (finding extrema of trig)

Most calculus students won't use the easy solution

Most calculus students won't use the easy solution

How to evaluate an infinite series with complex numbers

How to evaluate an infinite series with complex numbers

If 1+z+z^2+z^3+z^4+z^5+z^6=0, then z+z^2+z^4=?

If 1+z+z^2+z^3+z^4+z^5+z^6=0, then z+z^2+z^4=?

Can A^2+I=0?

Can A^2+I=0?

The perfect trick to solve this equation (two-cube-root!)

The perfect trick to solve this equation (two-cube-root!)

A taste of "when there are no numbers in math"

A taste of "when there are no numbers in math"

Believe in calculus, NOT pictures!

Believe in calculus, NOT pictures!

100 integrals (remake + solutions) full collection on Patreon

100 integrals (remake + solutions) full collection on Patreon

Big Brilliant Integral

Big Brilliant Integral

$What Integration Technique Do I Use? Q1 to Q5 (trig sub, u sub, DI method, partial fraction) calc 2$

What Integration Technique Do I Use? Q1 to Q5 (trig sub, u sub, DI method, partial fraction) calc 2

The last virtual office hour! (Chegg Trig & Precalculus)

The last virtual office hour! (Chegg Trig & Precalculus)

The coolest way to solve an equation!

The coolest way to solve an equation!

cube roots of i

cube roots of i

All solutions to x^2=2^x (remake+notes)

All solutions to x^2=2^x (remake+notes)

A quick guide to finding the range of a fuction! Chegg Trig & Precalculus office hour

A quick guide to finding the range of a fuction! Chegg Trig & Precalculus office hour

I finally found the cubic vertex formula without calculus!

I finally found the cubic vertex formula without calculus!

Are they the same function? Be careful with the domain! Chegg Trig/Precalculus office hour

Are they the same function? Be careful with the domain! Chegg Trig/Precalculus office hour

Making a cubic equation have a double root

Making a cubic equation have a double root

5 Math Video Categories That Grew My Channel (12 Years on YouTube)

5 Math Video Categories That Grew My Channel (12 Years on YouTube)

How to solve logarithmic equations! Chegg Trig & Precalculus Office Hours with blackpenredpen

How to solve logarithmic equations! Chegg Trig & Precalculus Office Hours with blackpenredpen

My first x^x congruence: x^x≡2 (mod5)

My first x^x congruence: x^x≡2 (mod5)

Let's solve exponential equations! Chegg Trig & Precalculus Office Hour!

Let's solve exponential equations! Chegg Trig & Precalculus Office Hour!

How to solve HARD polynomial equations! Chegg Trig & Precalculus Office Hours

How to solve HARD polynomial equations! Chegg Trig & Precalculus Office Hours

Math for fun: a 2nd derivative rule?

Math for fun: a 2nd derivative rule?