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Compute the sum \\Ival- (Hints: A picture will help. How much smaller is va compared to vi? The value of the sum is 18) 2. (20 points) Parametrizationve of intersection of the cylinder a? + y? = 1 and the plane y + = = 1; then find the equation of the line that is tangent to this curve at the point (1, 0, 1)