About blackpenredpen

This channel is about math for fun! Most of the topics will be calculus-based. Sometimes we will also investigate some weird equations and complex numbers! Feel free to subscribe if you also like math!

If you are looking for calculus tutorials for your #precalculus, college #calculus1, college #calculus2, #APcalculusAB, or #APcalculusBC, then please visit my "just calculus" channel: https://bit.ly/just_calc