#motion of a particle moving in a circle

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obsidian fern
cursive coveBOT
vast patrol
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?

keen radish
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This looks easy

kind spire
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Remember that i is a unit in the x direction, j is a unit in the y direction, and k is a unit in the z direction. The problem actually gives a lot of extraneous information- really, you can extract this equations x(t), y(t), and z(t) just by looking at the equation for r(t)