Qualification > Math

math in hl HELP

<< < (4/10) > >>

IGSTUDENT:
geometric progression.

how did you get 8?

Ghost Of Highbury:
i have answered it...scoll up in the first page

IGSTUDENT:

--- Quote from: IGSTUDENT on September 07, 2009, 12:35:36 pm ---

Actually it is a GP question:

k/2, k+8, k^2 are in gp find k

--- End quote ---
Thanks!!

nid404:

--- Quote from: sweet777 on August 17, 2009, 03:51:51 pm ---yea...basically proving an identity....for example:
(1-sinx)/(cosx) = (cosx)/(1+sinx)

--- End quote ---

LHS

1-sinx/cosx

multiply by 1+sinx/1+sinx...this only to get the value in the denominator...we're actually not changing anything u see cause 1+sinx/1+sinx=1

so
1-sin2x/cosx(1+sinx)
u know that
1-sin2x=cos2x
so
cos2x/cosx(1+sinx)
cancel the cosx from top and bottom
cos2x/cosx(1+sinx)
cosx/1+sinx

hope u got it

Ghost Of Highbury:

--- Quote from: nid404 on September 07, 2009, 03:45:22 pm ---
--- Quote from: sweet777 on August 17, 2009, 03:51:51 pm ---yea...basically proving an identity....for example:
(1-sinx)/(cosx) = (cosx)/(1+sinx)

--- End quote ---

LHS

1-sinx/cosx

multiply by 1+sinx/1+sinx...this only to get the value in the denominator...we're actually not changing anything u see cause 1+sinx/1+sinx=1

so
1-sin2x/cosx(1+sinx)
u know that
1-sin2x=cos2x
so
cos2x/cosx(1+sinx)
cancel the cosx from top and bottom
cos2x/cosx(1+sinx)
cosx/1+sinx

hope u got it


--- End quote ---
was answered by astar...
but...nevertheless...ur answer wud suit him..

Navigation

[0] Message Index

[#] Next page

[*] Previous page