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What is the relationship between the object distance from the lens and the image magnification? Explain? Which valve is used in the construction site? And why? How do i find coordinates of the point on the curve y=(x-2)^2 where there is a tangent line perpendicular to line 2x-y+2=0? Why silt is nessesary? How do I use integration by parts for the following: (sin^4)(3xcos^4)3xdx?