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Find the curvature and the radius of curvature at the stated point. r(t)=4⁢ ⁢cos⁢ t⁢ i+5⁢...

Find the curvature and the radius of curvature at the stated point. r(t)=4⁢ ⁢cos⁢ t⁢ i+5⁢ sin⁢ ⁢t⁢ j+6⁢t⁢ k; t=π/2

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