Edexcel A2 C3 Mathematics 12th June 2015Watch

This discussion is closed.
3 years ago
#661
someone explain part b to me I don't understand
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3 years ago
#662
(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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3 years ago
#663
(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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3 years ago
#664
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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3 years ago
#665
I just died doing the june 2013 paper...
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3 years ago
#666
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3 years ago
#667
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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3 years ago
#668
so has anyone learnt their trigonometric identities yet? XD
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3 years ago
#669
(Original post by crepole)
so has anyone learnt their trigonometric identities yet? XD
Yeahhhhh... Nope

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3 years ago
#670

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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3 years ago
#671
(Original post by Ann1234)

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 :-)

Attachment 411743

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1
3 years ago
#672
(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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3 years ago
#673
(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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3 years ago
#674
(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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3 years ago
#675
(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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3 years ago
#676
(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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3 years ago
#677
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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3 years ago
#678
(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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3 years ago
#679
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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3 years ago
#680
(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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