spndsh
d/dt (a(t-sint)i-hat + a(1-cost)j-hat)
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Ahaanomegas
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You need to differentiate each component of the original vector to get the components of the differentiated vector.
spndsh
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|dw:1349560630436:dw| is this right?
Ahaanomegas
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No.
1. You forgot to multiply by the constant a.
2. The derivative of sin is cos, not -cos.
Try again! :)
spndsh
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a(1+cos t) + sint
spndsh
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its -sint
Ahaanomegas
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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. ;)
Ahaanomegas
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Try writing it as (at - a sin t, a - a cos t). It makes it easier for me. Try that for yourself!
spndsh
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|dw:1349561042586:dw| what about this?
Ahaanomegas
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There you go! Good job. :)
spndsh
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thanks so much!
Ahaanomegas
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No problem! Do you see the general method of this so that you can do similar problems in the future?
Ahaanomegas
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By the way, you're a good learner, @spndsh (!!!)