Author Topic: Maths papers(new format)  (Read 4234 times)

holtadit

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Re: Maths papers(new format)
« Reply #15 on: May 01, 2010, 11:16:57 am »
I updated the pic to make things clearer.

Offline Vin

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Re: Maths papers(new format)
« Reply #16 on: May 01, 2010, 11:18:29 am »
oh thank u so much..
sorry i forgot to tell u so stupid of me i already figured the a) ques..

i wanted b) thanks fo ya time.. :)
sorry again!!

but i liked this method too!!

holtadit

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Re: Maths papers(new format)
« Reply #17 on: May 01, 2010, 11:31:09 am »
5 + 4 sin30*0

zero since its zero hours after midnight.  Asnwer is 5 m

Okay for ii)    5 + 4 sin (30*10) = 1.54m

iii)   5 + 4*sin 360 since 12 hours is the max after midnight

 



Offline Vin

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Re: Maths papers(new format)
« Reply #18 on: May 01, 2010, 12:00:04 pm »
got it till b ii)

but for iii)  5 + 4*sin360   equals 5 thts wat i thought..
but the ans is 9m in ms!!
confused ???

they might hav taken  5  +  4* sin(30 * 3) 3 am/pm
ans to the next is also 3 am n 3 pm..

so basically its trial n error..try till u get the greatest value!

Offline Vin

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Re: Maths papers(new format)
« Reply #19 on: May 01, 2010, 12:02:05 pm »
nyway sorry another doubt!!

Offline Ghost Of Highbury

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Re: Maths papers(new format)
« Reply #20 on: May 01, 2010, 12:45:18 pm »
The whole question or any subpart?
divine intervention!

Offline Ghost Of Highbury

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Re: Maths papers(new format)
« Reply #21 on: May 01, 2010, 01:22:11 pm »
7)a)i) T(A) means to apply the transformation T to the point A. As T is a vector translation u can simply add the respective co-ordinates to get the co-ordinates of the image after the translation. (2) + (3) = (5)
                                                           (1) + (2)  = (3)

Therefore the answer is (5,3)

7)a)ii) Now, MT(A) means to apply the transformation T first and then apply M to the new image.
         After applying T , the image's co-ordinates are (5,3)

         M is reflection in the line y=x. First, draw the line y=x, reflect the point. The new co-ordinates shud be (3,5).

        PS : Wenever a point on the cartesian plane is reflected in the line y=x, the image co-ordinates are actually the inverse of the object co-ordinates.

7)b) This is a direct question . Answer : (0 1)
                                                      (1 0)

       U can find the list here : https://studentforums.biz/index.php/topic,5575.msg167872.html#msg167872    (3rd message)

7)c) For this u have to do the transformation mentioned in the q i.e TM(Q)
       
       So, M(Q) = (k-3, k-2)   (Remember the reversing method)

      T(k-3, k-2) = ((k-3) + 3, (k-2) + 2) = (k,k)

       The y-co-ordinate of the image is k, and the x-co-ordinate of the image is also k. Thus its always on the line y=x..

7)d) The inverse of the identity matrix remains the same,

7)e)i) N = (0 4) - (0 3)  = (0  1)
              (0 0)   (1 0)     (-1 0)

7)e)ii) Check the list : https://studentforums.biz/index.php/topic,5575.msg167872.html#msg167872

          rotation 90 degrees clockwise around centre (0,0)
divine intervention!

Offline Vin

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Re: Maths papers(new format)
« Reply #22 on: May 01, 2010, 01:41:24 pm »
OMG!!!! THANK YOU SO SO MUCH FOR YA HELP !! :D :D
really u've made my day! :) :P
awesome didnt expect ny1 to do this for me
thanks again!!:):)
By the way the links are really good.. ;D

Offline Ghost Of Highbury

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Re: Maths papers(new format)
« Reply #23 on: May 01, 2010, 03:49:56 pm »
No trouble.
divine intervention!

6394

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Re: Maths papers(new format)
« Reply #24 on: May 10, 2010, 03:16:23 pm »
or u can remembr it this way "ALL SILVER TEA CUPS"
ALL: all
SILVER: only sine
TEA : only tan
CUPS: only cos
    :) :) :) :) :) :) :)

Offline ankitd_1994

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Re: Maths papers(new format)
« Reply #25 on: May 15, 2010, 02:30:36 pm »
Use the pic.

a = all trig functions are positive in this quadrant

s = only sine is positive in this quadrant

t= only sine is positive in this quadrant

c= only sine is positive in this quadrant

so if sine and cos are negative they must be in between 180 and 270.

u cn also use the sentence 'all silver tea cups' (ASTC) to remembr the quadrant thing...it actually helpd me in nov 09 add maths