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# OCR MEI DE June 17 2016

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1. (Original post by Geo_)
Yeah that's precisely what I did. Ok that's alright then, I can definitely cope with 1 mark lost.
Although, because it asked for the time difference between the 1st and 2nd times they are equal, surely that will be the difference between when t=pi/6 and t=3pi/2 ? As 5pi/6 would be the third time they are equal to each other

Posted from TSR Mobile
5pi/6 is smaller than 3pi/2 so would occur first but its only one mark so no major issueee
5pi/6 is smaller than 3pi/2 so would occur first but its only one mark so no major issueee
Haha yeah of course sorry! Apparently my brain doesn't work on a Saturday...

Posted from TSR Mobile
3. Does anyone have a copy of the question paper?
4. (Original post by Geo_)
Yeah that's precisely what I did. Ok that's alright then, I can definitely cope with 1 mark lost.
Although, because it asked for the time difference between the 1st and 2nd times they are equal, surely that will be the difference between when t=pi/6 and t=3pi/2 ?

Posted from TSR Mobile
t= 1.5pi isn't a root of that equation.
5. The answer to the last part was , because it was the difference between and - there was a root at , but it wanted the time difference between the first two occurrences, which are both when , as you can tell by drawing a sine graph.

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Updated: June 18, 2016
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