1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Show that

  1. Nov 1, 2009 #1
    1. The problem statement, all variables and given/known data
    Show that sen² 25º + cos² 45º + sen² 65º = 3/2



    2. Relevant equations
    cos 45º= 1


    3. The attempt at a solution
    I get confused with the ² on the cos and sen...
     
  2. jcsd
  3. Nov 1, 2009 #2

    tiny-tim

    User Avatar
    Science Advisor
    Homework Helper

    Hi Fanekaz! :smile:

    (btw, it's sin, not sen :wink:)
    It just means that the whole thing is squared …

    so sin2x means (sinx)2

    (pronounce it "sine squared of x")

    it saves writing brackets. :biggrin:
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook