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20. Find The Unit Normal Vectors N To The Curve At The Given Point. R(t) =(6 Cost, 6 Sint, 6 Ln(cost

20. Find the unit normal vectors N to the curve at the given point. r(t) =(6 cost, 6 sint, 6 ln(cost), (6,0,0) a. (1/4)(-V2,0,-v2) b. (11/2) (1,0,1) c. (1/?2)(-1,0,-1) d. (1/2)(1,0,-1)