Aha! Yes! Thanks so much!! You are so incredibly kind!

( I mean-how do you know when positive and when negative?)

Thanks both! That makes perfect sense.. and yeah! I saw the mark scheme and thought: whaaaat?!! One last question please - why do you use negative e for the second collision?

Love all this! But also the word antiderivative - makes me feel heroic when I find it! 🙃

Thanks so much! This makes sense!

I think this is why I was getting mixed up!!! Phew! I think now it all makes sense!

Perfect! And agree! Thanks so much! Such a great community

Thanks! Either a+b or 180-a-b.

Oh- thanks! The other definition I had was (following your description) 180-A-B . I got confused with Q1 June 2012 M4 edexcel.

Thanks both! My college is getting us the cg-100 this year. Up until now I just used the 991 so a lot to learn!

Oh! This is so good! Thank you so much! You are very generous!

a level: modulus function - if time a venn diagram for stats taster. Further: complex numbers