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Differential Equationshard
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Consider the nonlinear differential equation dzdθ=z2+5zθ+3θ2θ2\frac{dz}{d\theta} = \frac{z^2 + 5z\theta + 3\theta^2}{\theta^2}dθdz​=θ2z2+5zθ+3θ2​. Which substitution reduces this to a separable equation in terms of vvv where v=zθv = \frac{z}{\theta}v=θz​?