Describe in general terms the following helical'' type motions: a. r(t) = sin t i + cos
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a. r(t) = sin t i + cos t j + tk
b. r(t) = sin t3 i + cos t3 j + t3 k
c. r(t) = sin (t3 + π) i + t3 j + cos(t3 + π)k
d. r(t) = t sin t i + cos t j + tk
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