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Math Help - trig question 2

  1. #1
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    trig question 2

    prove that sin(a+b) = tan a + tan b
    cos a cos b
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  2. #2
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    Quote Originally Posted by dane View Post
    prove that sin(a+b) = tan a + tan b
    cos a cos b
    Hi dane,

    \frac{\sin (a+b)}{\cos a \cos b} = \frac{\sin a \cos b + \cos a \sin b}{\cos a \cos b}=\frac{\sin a \cos b}{\cos a \cos b}+\frac{\cos a \sin b}{\cos a \cos b}=...

    Simplify this and you should get what you want.
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