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Math Help - Establish the following Identities

  1. #1
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    Establish the following Identities

     \frac{\sin[x]}{\tan[x]} +\cos[x]=\sec[x]
    I can get this to be 2 cos x = sec x

    I cannot see how to get those equal
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  2. #2
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    Quote Originally Posted by IDontunderstand View Post
     \frac{\sin[x]}{\tan[x]} +\cos[x]=\sec[x]
    \displaystyle\frac{\sin{x}}{\frac{\sin{x}}{\cos{x}  }}+\cos{x}=\cos{x}+\cos{x}=2\cos{x}

    I don't know how you are going to get sex{x} out of that though
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  3. #3
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    Quote Originally Posted by dwsmith View Post
    \displaystyle\frac{\sin{x}}{\frac{\sin{x}}{\cos{x}  }}+\cos{x}=\cos{x}+\cos{x}=2\cos{x}

    I don't know how you are going to get sex{x} out of that though
    Thank you. That is what I was thinking. Maybe it is a typo.
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  4. #4
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    I agree with dwsmith. If you plug in x=20^{\circ}, you get an inequality.
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