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URGENT C4 Solomon Paper D Q7(b) help!

Can someone please explain the mark scheme to this question as I swear cot(of any angle) cannot equal 0?
https://5c59854d0ccd29d489c9e5e689a8bbadf49aa0f0.googledrive.com/host/0B1ZiqBksUHNYREhxMHhfam1IQm8/for-Edexcel/Solomon%20D%20MS%20-%20C4%20Edexcelpdf.
(edited 7 years ago)
:K: where is the post? @Mr_Chipz
Reply 2
Avatar for Mr_Chipz
Mr_Chipz
OP
1
Original post by SeanFM
:K: where is the post? @Mr_Chipz


Sorry, I mentioned the question in the title of this post. It's question 7b from this paper below:
https://5c59854d0ccd29d489c9e5e689a8bbadf49aa0f0.googledrive.com/host/0B1ZiqBksUHNYREhxMHhfam1IQm8/for-Edexcel/Solomon%20D%20QP%20-%20C4%20Edexcel.pdf

However I'm struggling to understand the mark scheme for that question (see below link):
https://5c59854d0ccd29d489c9e5e689a8bbadf49aa0f0.googledrive.com/host/0B1ZiqBksUHNYREhxMHhfam1IQm8/for-Edexcel/Solomon%20D%20MS%20-%20C4%20Edexcel.pdf

Help would be much appreciated :smile:
Reply 3
Avatar for Icyytea
Icyytea
5
You have to split it into cos and sin
-2/3 cot2t=0
=>cot2t=0
=>cos2t/sin2t=0
=>cos2t=0
Original post by Mr_Chipz
Can someone please explain the mark scheme to this question as I swear cot(of any angle) cannot equal 0?
https://5c59854d0ccd29d489c9e5e689a8bbadf49aa0f0.googledrive.com/host/0B1ZiqBksUHNYREhxMHhfam1IQm8/for-Edexcel/Solomon%20D%20MS%20-%20C4%20Edexcelpdf.


Yes it can.

Reply 5
Avatar for Mr_Chipz
Mr_Chipz
OP
1
Original post by Icyytea
You have to split it into cos and sin
-2/3 cot2t=0
=>cot2t=0
=>cos2t/sin2t=0
=>cos2t=0


Oh I was thinking that, but I wasn't sure that was the right method, I used cot2t = 1/tan2t, but then obviously tan2t can't equal zero since you can't divide by 0...so that confused me :smile:. But yeh I understand now, thank you!! :smile:
Reply 6
Avatar for Mr_Chipz
Mr_Chipz
OP
1
Original post by Student403
Yes it can.



Aaah, good old Desmos...Yeh sorry for being an idiot, thanks!

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