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The height at which the acceleration due to gravity becomes g/9. in terms of r, radius of the earth is? Find the point on the graph of y= x^3+3x^2-9x-12 at which the tangent line is horizontal.? Find the slope of the tangent line to the curve y = x/(1-x) at the point (.5,1). Find the equation of that tangent line.? Vector A makes an angle of 20° and B makes an angle of 110° with the x axis. The magnitudes of A= 20 mag of b = 30. Find angle of resultant? Non-artificial harmful things for plants?