How was the second formula shown in image (d^2y/dx^2) derived? [From Riley, Hobson & Bence Mathematical Methods for Physics and Engineering, page 503, Legendre Linear Equations] : r/askmath
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Why is dy/dx of 2y not equal to 0? I mean, there is no 'x' in 2y, so why can't we consider 2y as a constant, and thus say it is equal