Uploaded July 2025 | Updated September 2026, 2 weeks ago

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In this math video I (Susanne) got a birthday card with a twist: instead of a number, it had a full-on math puzzle! In this video, I walk you through the expression step by step — solving square roots, powers, a binomial coefficient, the determinant of a matrix using Sarrus’ Rule, a logarithm, sine on the unit circle, and even a factorial. Whether you’re here for fun, math practice, or just curiosity, you’ll find something to enjoy — and maybe learn along the way! Mathematics explained.

00:00 Intro – Birthday Card
0:21 Let’s solve this
2:31 Factorial
3:37 Binomial Coefficient
6:23 Unit Circle
9:14 Determinant Matrix
11:49 See you later!

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#birthday #maths #puzzle