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anonymous

  • 4 years ago

(a) find all points of intersection of the graphs of the two equations, (b) find the unit tangent vectors to each curve at their points of intersection, and (c) find the angles between the curves at their points of intersection. y = x^3 and y = x^(1/3)

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  1. dumbcow
    • 4 years ago
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    \[x^{3} = \sqrt[3]{x}\] \[x(x^{8}-1)=0\] \[\rightarrow x = -1,0,1\]

  2. anonymous
    • 4 years ago
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    ooh thank you. do you have any idea how to do part B or C? :T

  3. dumbcow
    • 4 years ago
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    well im not sure exactly what they are looking for to find the slope tangent to each curve, take the derivative and do they want the angle between the vectors?

  4. anonymous
    • 4 years ago
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    they're looking for the angle between the vectors i think

  5. dumbcow
    • 4 years ago
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    after taking derivative of each function \[dy/dx = 3x^{2}\] \[dy/dx = \frac{1}{3\sqrt[3]{x}^{2}}\] at points x=+-1, function A has slope 3 function B has slope 1/3 in vector form: function A : <1,3> function B : <3,1> Both have same magnitude sqrt(3^2 +1) = sqrt10 unit vectors: <1/sqrt10, 3/sqrt10> <3/sqrt10, 1/sqrt10> to find angle use : \[\cos(\theta) = \frac{u*v}{|u|*|v|}\] u*v = 1*3 + 3*1 = 6 |u|=|v| =sqrt10 \[\cos(\theta) = \frac{6}{10}\] \[\theta =53.13\]

  6. dumbcow
    • 4 years ago
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    oh at x=0, slopes are 0 and undefined thus angle is 90

  7. anonymous
    • 4 years ago
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    thankss!

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