let r ( t ) find the point where r ( t ) intersects the xy plane on the interval 4 pie 1 1 is less than t which is less than 6 pie 1 3

Question

let r ( t )   find the point where r ( t ) intersects the xy plane on the interval 4 pie   1 1 is less than t which is less than 6 pie   1 3

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let r ( t ) = find the point where r ( t ) intersects the xy plane on the interval 4 pie / 1