Letter to a Friend 3. (a) Compute the arclength of the curve with para- materization (x, y) = (a cos3 0, a sin3 0) , 0 0 is a constant with units of feet. Explain your reasoning. (b) Let P be a point in the first quadrant on the above curve that is s feet from the point A(a, 0) as measured along the curve. Express the distance from P to the x-axis as measured along the tangent line to the curve at P in terms of s. Explain your reasoning