'Dy dx 0 2' presentation slideshows

The slope of the tangent is dy/dx and the slope of line joining the

i) Find curves for which tangent at a point always perpendicular to the line joining the point to the origin. The slope of the tangent is dy/dx and the slope of line joining the point (x,y) to the origin is y/x and since these lines are given to be orthogonal dy/dx=-x/y

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