- Differential equation: integrating factor ydx+(2xy-e^(-2y)dy = 0?

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Why is a ^ ln b = b ^ ln a? What is the relationship between latitude and vegetation? What is the chemical formula for road salt? Solving using laplace transform? y" +3y' + 2y =t? initial conditions are y(0)=1, y'(0)=0? Suppose that A ⊆ B ⊆ V .
(a) Prove that span(A) ⊆ span(B).
(b) Prove that if B is linearly independent then A is linearly independent.?