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can you do this?

Discussion in 'DAT Discussions' started by Dencology, Jun 4, 2008.

  1. Dencology

    Dencology 2+ Year Member

    Mar 7, 2008
    guys how do you do this:

    if sin(2teta)= 2sine[teta]cos[teta] then
    (sine 15)(cos 15)= ?

    a. 1/4
    b. sqroot of 2/4
    c. sqroot of 3/4
    d. 1

    please explain how you got your ans. thanks.
    Last edited: Jun 4, 2008
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  3. happyasaclam88

    happyasaclam88 7+ Year Member

    Oct 16, 2007
    sin(15)cos(15) is then equal just to sin(2*15)/2 (the two is from the other side of the double angle formula). so that's sin(30)/2, or sin(pi/6)/2 is radians is more your thing.
    sin(pi/6) is 1/2, over 2 is 1/4, so the answer is a. at least, i hope it is ...

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