Trigonometry & Modelling 20 • Modelling • P2 Ex7G • 💡

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Specification: Edexcel Pure Year 2
Recorded: 12/11/20

[RovliAckerman]

6:18 why did we limit the range of answers we could use to 0 and 2pi when 4pi would have been valid since the answer would not exceed the range 0<x<72

[ehehrrhr]

hi bicen, thanks to your videos i scored 97% on my pure year 1 maths mock, im currently beginning year 2 content, do you have any advice on how to deal with the change in difficulty, and is this chapter one of the harder year 2 chapters in your opinion?

[LADI]

Hello, sir is it possible to use the CAST diagrams for this problem at 9:59. When I used the CAST diagrams I got different solutions.

[aalexdani]

for part b ( 5:57 ), why was the range not changed to 1.1022 < x/3+1.0122 < 25.1022 ?

[bnmnmnm]

Can you still find the x values if you take away 1.0122 and multiply 3 to the arccos value instead of changing the range for x at 8:43

[navzz]

Hi bicen, in part b when you get x=15.81 hours, when you convert this to hours and minutes on your calculator you actually get 15 hours 48 minutes and 36 seconds. would this answer also be fine?

[Anna-uxkg]

Why is the max value of t when cos(x/2+1.0122)=1 I thought you would equal it to 0 and then solve since cos(0) is 1 and cos(1) is 0.99... In degrees

[jefking]

Hi sir, if i get a solution after solving a trig equation then use a graphics calculator to give me the rest of the values in the range. Will i lose marks?

[marondbritto]

i sorry but at the time 9.3 how did you swap the -3/89 with what was in the cos brackey then turn the cos to a inverse i didnt really get it

[G-xebc]

9:45 how do you automatically know to minus 1.8944 from 2pi to find the second answer?

[jefking]

Hi sir, For part d) right at the end i got uptill t=2.1 before making a silly mistake. Will i atleast get 5 marks?

[Blessing_]

for 16:40 im confused on part 4 where the markscheme shows ddM1 on the right, why is it pi- that

[UNKNOWN-jkwv]

Hi sir for part B of the question at 6:21, are we always supposed to take the minimum if they don't ask for a maximum.

[lisaelliott]

For part b at 5:43 why can’t the fact that cos repeats every 2pi and that cosx = cos(2pi-x) be used here to get more solutions?

[engineeringmadeasy]

Hi Bicen, 16:33, where can I find the answer to the part e? thanks

[rid]

Hi sir, for the last question 7d, how do you get 14:06 from t = 2.1?

[aaronh]

hello sir i was managed to get all the marks for the final question but i was just wondering how u got 18:43, i could only get the 14:06 answer

[chuchu]

Is there a second part to this video because it says part 1

[Rua]

5:40 how do we know whether to use radians here?

[toxins]

Sir do u have the answer to part e 16:31