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How to determine if cos(225degrees) is greater than zero, less than zero etc..? If [2x(y-2)/y+1] = 6x then y+1/y-3 equals? How do I prepare for AP Physics ? What is a good book to buy to study the design of tooling used for injection molding? Thanks.? 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?