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C3 January 2013 25/01/2013

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Reply 1800
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TDL
2
Original post by lopper
the half angle formula is in the formula sheet rite?


nop
Reply 1801
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Alex_1
Original post by lopper
half angle has often appeared in c4 not c3 in the past papers so wonder if they would give a question about it this time around.:smile::eek:


I was doing Solomon papers and there were couple of half angle questions but I guess they are the tougher version of the normal paper. Hopefully it doesn't come up
Are there any proofs we need to know?
So I just woke up thinking this was a morning exam... To check with the edexcel website and find that its an afternoon exam! Can anyone else confirm this? I'm a retake candidate so don't know anyone else taking the exam... Such an idiot haha


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Original post by katiecornish
So I just woke up thinking this was a morning exam... To check with the edexcel website and find that its an afternoon exam! Can anyone else confirm this? I'm a retake candidate so don't know anyone else taking the exam... Such an idiot haha


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yeah it's at 1PM
Reply 1805
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arman258
Original post by katiecornish
So I just woke up thinking this was a morning exam... To check with the edexcel website and find that its an afternoon exam! Can anyone else confirm this? I'm a retake candidate so don't know anyone else taking the exam... Such an idiot haha


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Hi, the exam is in the afternoon. Ours is at 3 o'clock
between -180<x<180 will sin positive ?


in quadrants if you are dealing with negative like -9-, -180 you do backwards right


and between 0-270 for example tan will be positive and sin will be positive right
Reply 1807
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kvohra
Original post by otrivine
between -180<x<180 will sin positive ?


in quadrants if you are dealing with negative like -9-, -180 you do backwards right


and between 0-270 for example tan will be positive and sin will be positive right


Between 0 and 180 sin is positive. Between 0 and 90 and between 180 and 270 tan is positive


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just going through june 2012 videos nw
definitely gooing to fal this if it's a hard paper. probably going to fail it anyway, xD
Reply 1809
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kvohra
Original post by kvohra
Between 0 and 180 sin is positive. Between 0 and 90 and between 180 and 270 tan is positive


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From -90 to. 90 cos is positive


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Original post by Kreayshawn
yeah it's at 1PM


Original post by arman258
Hi, the exam is in the afternoon. Ours is at 3 o'clock


Thank you both - put my mind at rest! :-)


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How many marks do you reckon I can drop to still get 90 UMS? What has the range been over the years? :smile:


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Original post by paigegiap
How many marks do you reckon I can drop to still get 90 UMS? What has the range been over the years? :smile:


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Definitely no more than 5...

If the exam is easier than usual which I doubt...

grade boundaries could be as high as 73 for 90 UMS
Do we need to know how to proof for Sin (A+B) and Cos (A+B)
Can differentiate cot(x) ... by making it equal to cos(x)/sin(x)

How about if I make it equal [tan(x)]^-1
and I differentiate that...

Also how would I differentiate cosec and sec ?? :smile:

Thanks in advance
Original post by Samira123
Do we need to know how to proof for Sin (A+B) and Cos (A+B)


You mean double angle formula ?
I really don't think so.

but factor formulae proof may come up
Original post by posthumus
You mean double angle formula ?
I really don't think so.

but factor formulae proof may come up


No the actual addition formulae?
Original post by posthumus
You mean double angle formula ?
I really don't think so.

but factor formulae proof may come up

what proof , got any examples?
Reply 1818
Avatar for Air1337
Air1337
Guys when it comes to the quotient rule and say v = (x+3)^6

What would v^2 be? What's the rule for doing a power of a power? Thanks
there was arcsinx stuff in june right?
hopefully that means none today xD

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