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{x(t) = cos(t), y(t) = sin(t), z(t) = t} vs differentiate {x(t) = cos(t), y(t) = sin(t), z(t) = t}
{x(t) = cos(t), y(t) = sin(t), z(t) = t} vs differentiate {x(t) = cos(t), y(t) = sin(t), z(t) = t}
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