TMUA: Trig questions

[@neeldasgupta2441]

This topic-wise series is great!

[@solux9396]

Videos are great, find the trig the hardest bit of TMUA byt this is very clear

[@youtubeaccount8613]

amazing!!! thank you so much!!! hope i could apply these techniques in my coming TMUA paper! :)

[@flink6150]

when did u start revising 😍

[@youtubeaccount8613]

like yesterday :( i feel very unprepared. the boundaries are getting higher, and the papers are getting harder year by year, esp the 2022 paper! @@flink6150

[@abidmiah0617]

@@flink6150i started last week so don’t feel bad

[@andykaspe2496]

2:15 why is 1-2cos^2x the same as -cos2x

[@rtwodrew2]

It's a double angle formula. If you haven't seen them yet they might be worth quickly memorising before the paper: mathworld.wolfram.com/Double-AngleFormulas.html

[@istan9682]

For 2017 paper 1 Q8, why can we say both equations are less than 0. Why isn't greater than or equal to 0 the only equation

[@ayuzer6118]

Hey! If both equations are less than 0, they are both negative, so when you multiply both negatives, they result in a positive and thus >=0. So to get something >=0 by multiplying, both factors can either be positive or both can be negative

[@arthurbrisbane-m1c]

great video

[@aryanchegini]

Can you please do more triangle questions, especially q18 from paper b 2021

[@rtwodrew2]

I have no way of explaining that one outside of what I did in the 2021 video

[@aryanchegini]

@@rtwodrew2 Oh I didnt know you done a 2021 video, thank you.

[@teaclocked]

quick question, wouldnt the square root of sin^2x be modulus sinx or does it not matter?

[@rtwodrew2]

It is, and sometimes that does matter to TMUA