anonymous
  • anonymous
d/dt (a(t-sint)i-hat + a(1-cost)j-hat)
Mathematics
jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
You need to differentiate each component of the original vector to get the components of the differentiated vector.
anonymous
  • anonymous
|dw:1349560630436:dw| is this right?
anonymous
  • anonymous
No. 1. You forgot to multiply by the constant a. 2. The derivative of sin is cos, not -cos. Try again! :)

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anonymous
  • anonymous
a(1+cos t) + sint
anonymous
  • anonymous
its -sint
anonymous
  • anonymous
Nope. Again: 1. You need to write it as a vector. 2. You forgot the a on the y-component (j-hat). Try again! Don't get discouraged. This takes time to fully understand. ;)
anonymous
  • anonymous
Try writing it as (at - a sin t, a - a cos t). It makes it easier for me. Try that for yourself!
anonymous
  • anonymous
|dw:1349561042586:dw| what about this?
anonymous
  • anonymous
There you go! Good job. :)
anonymous
  • anonymous
thanks so much!
anonymous
  • anonymous
No problem! Do you see the general method of this so that you can do similar problems in the future?
anonymous
  • anonymous
By the way, you're a good learner, @spndsh (!!!)

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