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If the radius of the circle is increased by 6percent the area of the circle is increased by what percentage? How can we differentiate between alcohol and ether by chemical tests? What Density range of Thermoplastics? What is the mid line and amplitude of y = 5-4sin t / 5? Please help me with this math problem :) If f(g(x)) = g(f(x)) = x, and g(x) = 2 + ln(x+1), find f(4).?