Laplace Transform Poly Year 2

• Wireless-

  21 Jul 10, 19:06

  Find the laplace trans form for the following functions

   

  1i*) 4cos^2 (2t)

   

   

• Terminator Hitman

  21 Jul 10, 19:10

  oh..its u again.

• Wireless-

  21 Jul 10, 19:17

  Haha yup. nvm found the answer need to use this identity. Can show me how to derive this identity?

  

• Terminator Hitman

  21 Jul 10, 19:22

  ummm....i burnt all my tutorials many years ago.

• wee_ws

  21 Jul 10, 19:35

  Hi,

    First 2 results are double-angle identities, covered in Additional Maths.

    As for the 3rd result, consider RHS:

    1. numerator = 1 - cos(2u) = 1 - [ 1 - 2(sin u)^2 ]

    2. denominator = 1 + cos(2u) =1 + [2(cos u)^2 - 1 ].

    Thanks.

  Cheers,
  Wen Shih

• Terminator Hitman

  21 Jul 10, 19:45

  hey wee,

  slowly lookin like what i did in past....from formulas!!!!thats odd.......hmmmm..used to go on  questions with answers on 1 whole page in past .

• wee_ws

  21 Jul 10, 19:57

  Hi Wireless,

    You may read a short article I have written at:

    http://weews.webs.com/laplacetransforms.htm

    Hope it'll help to clarify your understanding of the topic.

    Thanks.

  Cheers,
  Wen Shih

• Terminator Hitman

  22 Jul 10, 12:38

  wee,

  damn...u selling past year tutorials???.....u accept paypal??:)

  download all worked out model answers too??wished they had the internet in those days......