I wrote a bit about it here! I always like doing reverse chain rule first and then showing how you can use substitutions after (like how you can use substitution to differentiate with chain rule although we usually teach it by some sort of INSIDE X OUTSIDE thing too)

chelekmaths.com/2025/10/10/i...

Thank you! Been super fun. Trying not to finish the course too early with top set year 11 so really going for it with the weird looking questions and challenges

Honestly didn't think about it at time of writing but definitely led to good conversation today!

Came after us doing these together and discussing whether we could blend our quadratics with our trig inequalities...

Definitely sketching a graph for now with year 11s, transferable skill from how we have been doing quadratic inequalities too 😊

So good! Thank you so much for pointing this out - I will dive in now!

chelekmaths.com/2025/10/23/m...

Did a little write up here with a link to the PPT :)

Looky-likeys is such a good word for them - some of my favourite sets of questions to write!

We have a circle theorem that tells us that they must be right angled 😊 getting students to recognize that is part of the fun!

Was meant to be tanx sec^2x and then I wrote it wrong and it ended up being a non example that lead to us watching a BlackPenRedPen video together to do it!

Oh wait the last one is a disaster would be better with just a radius of 10 not root 10