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Math Help - Trig Identities

  1. #1
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    Trig Identities

    Long time no see. This is actually for my roomate and we have not been able to solve this problem

    Secant X = CosineX + SinX x TangentX

    Any help is appreciated

    Nm thanks
    Last edited by Super Mallow; April 2nd 2008 at 03:15 PM. Reason: Figured it out
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  2. #2
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    NEW one to TRY

    Can you try to figure this one?

    cscx - sinx= (cotx/secx)
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  3. #3
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    sec(x)=cos(x)+sin(x)tan(x)

    Let's turn the right into the left:

    cos(x)+sin(x)\cdot\frac{sin(x)}{cos(x)}

    cos(x)+\frac{sin^{2}(x)}{cos(x)}

    \frac{cos^{2}(x)+sin^{2}(x)}{cos(x)}

    As you should know, the numerator is equal to 1 and we have:

    \frac{1}{cos(x)}=sec(x)
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  4. #4
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    csc(x)-sin(x)=\frac{cot(x)}{sec(x)}

    \frac{1}{sin(x)}-sin(x)=\frac{\frac{cos(x)}{sin(x)}}{\frac{1}{cos(x  )}}

    \frac{1-sin^{2}(x)}{sin(x)}=\frac{cos^{2}(x)}{sin(x)}

    \frac{cos^{2}(x)}{sin(x)}=\frac{cos^{2}(x)}{sin(x)  }
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