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Math Help - trig identities

  1. #1
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    trig identities

    a stands for alpha b stands for beta


    a)cos(a+b)= b)2cos squared a - 1=


    c)tan2a= d)sin1/2theta=


    e) sin a =
    1+ cos a
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  2. #2
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    Quote Originally Posted by Dave19 View Post
    a stands for alpha b stands for beta


    a)cos(a+b)= b)2cos squared a - 1=


    c)tan2a= d)sin1/2theta=


    e) sin a =
    1+ cos a
    For a) - d) use the link I gave in your other thread.

    For e) what are you looking for? This is
    \frac{sin(a)}{1 + cos(a)}
    right? There are any number of equivalent forms that we might create from this. I'm not sure which one you would be looking for?

    -Dan
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