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collegegirl89 Group Title

please help!!!! i need to know the horizontal tangents of sin(25x) and the vertical tangents of cos(25x). I got answers of 0 and pi/25 and 25pi/2 and 75pi/2, but my online hw says that theyre wrong

  • one year ago
  • one year ago

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  1. richyw Group Title
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    \(f(x)=\cos(25x)\) has no vertical tangent lines, are you in cartesian coordinates?

    • one year ago
  2. richyw Group Title
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    for the first one you can just take the derivative and set it equal to zero. so \[\frac{d}{dx}(\sin25x)=\cos (25x)\cdot\frac{d}{dx}25x=25\cos (25x)\]

    • one year ago
  3. collegegirl89 Group Title
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    yeah the interval is from 0 to 2pi

    • one year ago
  4. collegegirl89 Group Title
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    ahh im confused

    • one year ago
  5. collegegirl89 Group Title
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    i thought that cos(25x), when set equal to 0 yielded pi/50 and 3pi/50

    • one year ago
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