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Find all solutions in the interval [0, 2π). sin2x + sin x = 0? Physiological adaptation? A certain lens focuses light from an object 2.55 m away as an image 46.2 cm on the other side of the lens. What is its focal length? Write the function f(x)+ |x+3|+|x+1| as a piecewise defined function.? How to determine if cos(225degrees) is greater than zero, less than zero etc..?