Advertisement
If you have a new account but are having problems posting or verifying your account, please email us on hello@boards.ie for help. Thanks :)
Hello all! Please ensure that you are posting a new thread or question in the appropriate forum. The Feedback forum is overwhelmed with questions that are having to be moved elsewhere. If you need help to verify your account contact hello@boards.ie

Little Maths Query

Options
  • 28-05-2009 3:48pm
    #1
    damienricefan
    Registered Users Posts: 165 ✭✭


    see 4 (b) (ii)

    http://www.studentxpress.ie/papers/trigsoln02.pdf

    how come whe the hald multplies by the one it stays as one ?

    I think it's cos the half multplies by the cos square x to form 2 cos square x but i'm not sure

    Just a little verfication if from people who can do trigonometry very well, no I think or im just guessings , not to be rude just that posts like that are never helpful ... thanks :D


Comments

  • Options
    #2
    timmywex
    Registered Users Posts: 2,626 ✭✭✭timmywex


    They multiplyed across by 2 to keep everything as whole number.

    notice where it becomes 2cos^2x instead of cos^2x as it was previously


  • Options
    #3
    alan4cult
    Registered Users Posts: 1,583 ✭✭✭alan4cult


    Am you should rewrite your post.
    I didn't understand a word of it.


  • Options
    #4
    Fringe
    Registered Users Posts: 1,082 ✭✭✭Fringe


    1/2(1 - cosx) means that the whole thing is multiplied by 1/2. If you multiplied this by 2, they would cancel and you'd be left with 1(1 - cosx). 1 multiplied by anything is quite an obvious answer.


Advertisement