Results 1 to 2 of 2

Math Help - sin and tan

  1. #1
    Member
    Joined
    Sep 2009
    Posts
    98

    sin and tan

    By writting 75 as 30+45, find the exact values of sin 75 and tan 75

    THANKS!
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor red_dog's Avatar
    Joined
    Jun 2007
    From
    Medgidia, Romania
    Posts
    1,252
    Thanks
    5
    Use the identities \sin(a+b)=\sin a\cos b+\sin b\cos a

    and \tan(a+b)=\frac{\tan a+\tan b}{1-\tan a\tan b}
    Follow Math Help Forum on Facebook and Google+

Search Tags


/mathhelpforum @mathhelpforum