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  1. whitecorp

    Mathematics: Post your doubts here!

    If frequency is doubled, period is halved. One cycle is completed in 180, not 360. Peace.
  2. whitecorp

    Mathematics: Post your doubts here!

    The last digit of this even number can be either 4 or 6, ie there are two choices for the last digit. Once the last digit is selected, you have 3 remaining front digits, and 4 unique numbers to choose from. For this, there are 4C3*3!=4*6=24 ways Hence, total number of ways =24*2 =48 ways...
  3. whitecorp

    Mathematics: Post your doubts here!

    Here are the solutions. Hope it helps. Peace.
  4. whitecorp

    Mathematics: Post your doubts here!

    No problem, am glad it helped. Peace.
  5. whitecorp

    Mathematics: Post your doubts here!

    I think you gave me the answer key rather than the actual questions themselves.
  6. whitecorp

    Mathematics: Post your doubts here!

    I just did? the end answer is n^2, which is clearly a perfect square expression.
  7. whitecorp

    Mathematics: Post your doubts here!

    Oh my bad haha, I kinda missed your post in this ocean of questions. Forgive me for that. Peace.
  8. whitecorp

    Mathematics: Post your doubts here!

    Here are my workings. Hope it helps. Peace.
  9. whitecorp

    Mathematics: Post your doubts here!

    The series 1+3+5+...........+(2n-1) constitutes an arithmetic progression (AP) that has n terms in all, first term of value 1 and common difference =2. Then we can simply use formula for sum to n terms, which is given by (number of terms divided by 2)*(sum of first term and last term) =n/2 *...
  10. whitecorp

    Mathematics: Post your doubts here!

    Is that y=1/(x^2) ? Because if it is then I am positive the answer you provided is incorrect.
  11. whitecorp

    Mathematics: Post your doubts here!

    There you go, hope it helps. Peace.
  12. whitecorp

    Mathematics: Post your doubts here!

    9(a) of part (i) or (ii) ?
  13. whitecorp

    Mathematics: Post your doubts here!

    Here are the full solutions. You may wish to take note that (ii) uses the R-formula; you can refer to this piece I written on my supplementary site: http://www.msharpener.com/2012/09/trigonometric-formulae-2.html Hope this helps. Peace.
  14. whitecorp

    Mathematics: Post your doubts here!

    No problem. Here are the workings for 11(ii): Hope it helps. Peace. (I am not exactly sure what is M1 and S1, but to me its just mathematics, so I guess it shouldn't be a problem at all).
  15. whitecorp

    Mathematics: Post your doubts here!

    I am not sure what you mean by y-intercept here, but for lgc =-0.6, assuming that you are solving for c, then c=e^-0.6 =0.549, which is definitely not 0.251. Hope this helps. Peace.
  16. whitecorp

    Mathematics: Post your doubts here!

    You will have to do long division before using partial fractions to split things up. Hope this helps. Peace.
  17. whitecorp

    Mathematics: Post your doubts here!

    By the way, it would be most appreciated if you can give me your answer to 11(i) so that I can solve (ii) for you efficiently. Peace.
  18. whitecorp

    Mathematics: Post your doubts here!

    Sorted out 8(iii) and 9(ii) for you here: 11(ii) coming up. Hope this helps. Peace.
  19. whitecorp

    Mathematics: Post your doubts here!

    The mid point of AC (ie M) is also equals to the mid point of BD. Since point B has been given in the question, point D can be discovered rather easily. The length of AD = length of any side of the square ABCD. Hope this helps. Peace.
  20. whitecorp

    Mathematics: Post your doubts here!

    Your image is too small, please upload a larger, clearer version. Peace.
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