Edexcel A2 C3 Mathematics 12th June 2015 Watch

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studentwiz
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someone explain part b to me I don't understand
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randlemcmurphy
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(Original post by studentwiz)
someone explain part b to me I don't understand
The amount of drug in the bloodstream is 10+(answer from part a). Then use t=1
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studentwiz
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(Original post by randlemcmurphy)
The amount of drug in the bloodstream is 10+(answer from part a). Then use t=1
I don't get it can you explain deeper sorry
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PassingMoment
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1 hour after the second dose is 6 hours after the first. Find the amount from the first does at this time by using 10e^(-6/8) and then add the amount from the second does after 1 hour, so 10e^(-1/8) Adding the answers together will give you 13.549
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Bustamove
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I just died doing the june 2013 paper...
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TeeEm
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useful material for the upcoming exams

http://www.thestudentroom.co.uk/show....php?t=3353445

http://www.thestudentroom.co.uk/show....php?t=3361867

http://www.thestudentroom.co.uk/show....php?t=3361905
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cerlohee
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Hi everyone, so I'm having trouble with this question: http://i.gyazo.com/90da8d80d402473cdbbd213855aedf55.png
I have worked out that b is 6, how do I then go onto work out A? Thanks

ALSO this question: http://i.gyazo.com/893eaaf9bd27c4b0a02a8512344a0a6c.png
I got a max value of 1.107 by making 100sinsq(theta-1.107)=0??
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crepole
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so has anyone learnt their trigonometric identities yet? XD
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Andy98
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(Original post by crepole)
so has anyone learnt their trigonometric identities yet? XD
Yeahhhhh... Nope

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Ann1234
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Can someone help me with part a of this question please. I don't get it from the 5th line of working onwards. Thank you!
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lam12
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(Original post by Ann1234)
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Can someone help me with part a of this question please. I don't get it from the 5th line of working onwards. Thank you!
It's from c1 , rationalising the denominator I think it's called :-)

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cerlohee
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(Original post by crepole)
so has anyone learnt their trigonometric identities yet? XD
1) sinsqtheta +cossqthea=1
2) tansqtheta + 1 = secsqtheta
3) cotsqtheta + 1 = cosecsqtheta
4) tantheta =sintheta/ costheta
5) cos2theta= cossqtheta - sinsqtheta
6) sin2theta= 2costhetasintheta

What am I missing?
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randlemcmurphy
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(Original post by cerlohee)
1) sinsqtheta +cossqthea=1
2) tansqtheta + 1 = secsqtheta
3) cotsqtheta + 1 = cosecsqtheta
4) tantheta =sintheta/ costheta
5) cos2theta= cossqtheta - sinsqtheta
6) sin2theta= 2costhetasintheta

What am I missing?
Are you planning on remembering identities such as:
cos(x)=sin(90-x)
sin(x)=cos(90-x)
sin(-x)=-sin(x)
cos(-x)=cos(x)
(The bottom two are rather easy to remember)
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cerlohee
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(Original post by randlemcmurphy)
Are you planning on remembering identities such as:
cos(x)=sin(90-x)
sin(x)=cos(90-x)
sin(-x)=-sin(x)
cos(-x)=cos(x)
(The bottom two are rather easy to remember)
Ahh do those come up! Have never seen them but they seem v useful! The bottom two are just sayign they're symmetrical about the y-axis?

Also, could you have a look at the questions I posted earlier lol? thanku :3
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samb1234
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(Original post by cerlohee)
Ahh do those come up! Have never seen them but they seem v useful! The bottom two are just sayign they're symmetrical about the y-axis?

Also, could you have a look at the questions I posted earlier lol? thanku :3
In 2013 if you didn't know that the relationship between sin40 and cos50 and vice versa you wouldn't have been able to do one of the questions

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cerlohee
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(Original post by samb1234)
In 2013 if you didn't know that the relationship between sin40 and cos50 and vice versa you wouldn't have been able to do one of the questions

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Ah yeah I remember that question! Thanks
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tajanamckenzie
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any tips with working out the range and domain? I know it's only one mark but I never know how to do it I'm usually just guessing and aiming for a* so need as many marks as possible
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lam12
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(Original post by randlemcmurphy)
Are you planning on remembering identities such as:
cos(x)=sin(90-x)
sin(x)=cos(90-x)
sin(-x)=-sin(x)
cos(-x)=cos(x)
(The bottom two are rather easy to remember)
Any examples of the bottom two being used?


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Cosmi
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http://www.examsolutions.net/a-level...June/paper.php

For 7d, why are only 2 solutions found for t? The equation says the value t can be between 0 and 12, giving 4 values as that is almost 2 full rotations.
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bbadonde2
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(Original post by Cosmi)
http://www.examsolutions.net/a-level...June/paper.php

For 7d, why are only 2 solutions found for t? The equation says the value t can be between 0 and 12, giving 4 values as that is almost 2 full rotations.
As the domain of t is 0 to 12. The way the sine graph is your next solution would be like 14 hours. Look at this but it's hard to explain on here! https://07a69ccf283966549a9350d1a669...%20Edexcel.pdf
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