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If cos x = 3/7; x is an angle in the fourth quadrant; what is cos(x/2)? Find the point on the graph of y= x^3+3x^2-9x-12 at which the tangent line is horizontal.? What happens if lidocaine is injected into the bloodstream? In a circle of radius 180 cm, and arc 276 cm long subtends an angle of how many radians? How many degrees? Write an equation showing ethylamine acting as a base and a nucleophile.?