c3 25th January 2013 exam

That would be so good

The question on x=coty

does my method work i converted the coty in the form of cos/sin and applied the quotient rule and used the sin^2x+cos^2=1 formula/

Also, i used another method where i differentiated the coty and mentioned the 1+cot e.t.c formula

yeah... as long as you've 'show that', you'll be fine.... there are many methods you know.... any will do...

oh gosh... i put the value 1 for cos(theta - 0.927). do you remember what was the mark for this question, plus the part after this question altogether?

ok good!

i got 1+sin45


i expanded the bracket and we had to use 2 identites for that question one was
sin2A=2COSASINA and sin^2x + cos^2x =1


the question on rates i got 593.49 then rounded to nearest which was £593.

i think it was just 4 marks for finding both maximum value of P(@) and @....

yep. same!

hmm okay what answer did you get for the last question part b where we have to get the exact value for t?

the question on finding t V=9500 bugged me a bit

i did the equation they gave = 9500
then i shifted the 500 on the other side

so got the two e equations = 9000

then mind went on thinking that cause there is a + sign and involving two e equations we can multiply cause e^x + e^y = (e^xy)

i got a wrong answer!!!!! one user posted that it was a factorising question. since 0.5^2 is o.25. it was factorisable!

the question on finding t V=9500 bugged me a bit

i did the equation they gave = 9500
then i shifted the 500 on the other side

so got the two e equations = 9000

then mind went on thinking that cause there is a + sign and involving two e equations we can multiply cause e^x + e^y = (e^xy)

why? cause we had the R value from above calculation and had to just put the 10 in the fraction?

4/12+10 something like that

well i was aiming for 100ums but after that its likely ill only get over 85ums if im lucky. 8b) ****ed with me. maximum question ****ed with but i knew exactly how to do it but i thought the wrong of maximums and minimums .

Yes, and the other one did u put cos(x-0.927something)=1 for max of deta

no... it would be cos(x-0.927...)=-1

what but they asked for maximum not minimum

I found this one difficult [sin(22.5)+cos(22.5)]^2... but recollected how to do it as soon as I left the xam...

OMG. I thought exactly the same as you in the exam. I thought I'd get 100 at that rate, then I got to 8b. Now I think I messed up other parts too from what people are saying on here.
I really need that A*

Lol, look at us insomniacs...

My friend said for 8c that you were supposed to divide £593 by 8? Because it was 8 years? I don't think so though...I left mine as 593.

8b was to form a quadratic. I plugged ky answer in and got 9500 exactly.

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