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# Official Edexcel C3 Discussion Thread watch

1. (Original post by amberf)
Also help on jan 07 q8

express arcsinx in terms of y ??!!!
how do you get arcsinx = ∏/2 - y ??

(sin is a translation of the cos graph by 90 degrees)

2. (Original post by samir12)
There is another way of doing the question:

yh i got up to the latter of the last 2 steps but i couldnt figure out how they got

to
[/QUOTE]

then i realised they used pythagorus
3. Gosh I'm really scared.
4. they give the differentiation formulae for sec, cosec, cot right?
5. (Original post by MadMaths)
yh i got up to the latter of the last 2 steps but i couldnt figure out how they got

to
I don't know why someone would actually do that method in the actual exam lol.
6. (Original post by Kameo)
I don't know why someone would actually do that method in the actual exam lol.
exactly....i thought it was abit odd
7. can I just ask something

what does 'root 3' + (root 3)/2 =

how do I find it in surd or exact form
8. btw guys, do you think the exam tomorrow will be alot more difficult since the last one (june 09) was relatively easy
9. you have to get a common denominator, so times root 3 by 2. then you would have (2root3 + root 3)/2, simply, so 3root3/2
10. (Original post by W.H.T)
btw guys, do you think the exam tomorrow will be alot more difficult since the last one (june 09) was relatively easy
might be the case...
11. Ooor just put Root3 + (root3)/2 into your caculator?
12. (Original post by Kameo)
you have to get a common denominator, so times root 3 by 2. then you would have (2root3 + root 3)/2, simply, so 3root3/2
thank you
13. I'm really confused what dy/dx of
sin^2 x is (sin squared x)
cos^2 x

can anyone help?
14. (Original post by Mattjames)
I'm really confused what dy/dx of
sin^2 x is (sin squared x)
cos^2 x

can anyone help?

I don't see where you got cos^2 from.
15. (Original post by samir12)

I don't see where you got cos^2 from.

i saw a question saying 3sin^2 x and just presumed there would be cos^2 somewhere.
so how do you work out the sin^2 x?
16. oh right, the second line didnt come up at first
and yer, i just presumed there would be dy/dx (cos^2 x) sort of thing.
17. hy....only 2 hours for the exam to start!!!!
18. (Original post by kosy91)
hy....only 2 hours for the exam to start!!!!
Where are you taking your exam ?
19. (Original post by kosy91)
hy....only 2 hours for the exam to start!!!!
WTF. Please tell me it's an afternoon exam
20. ya its afternoon

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