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Mathematics, 26.08.2021 18:40 HHHHHHHHHMMMMMMMMM
Verify that y = tan(x + c) is a one-parameter family of solutions of the differential equation y' = 1 + y2. Differentiating y = tan(x + c) we get y' = 1 + sec2(x + c) or y' = 1 + y2. Differentiating y = tan(x + c) we get y' = 1 + tan2(x + c) or y' = 1 + y2. Differentiating y = tan(x + c) we get y' = csc(x + c) or y' = 1 + y2. Differentiating y = tan(x + c) we get y' = sec(x + c) or y' = 1 + y2. Differentiating y = tan(x + c) we get y' = tan2(x + c) or y' = 1 + y2. (b) Since f(x, y) = 1 + y2 and ∂f/∂y = 2y are continuous everywhere, the region R in Theorem 1.2.1 can be taken to be the entire xy-plane. Use the family of solutions in part (a) to find an explicit solution of the first-order initial-value problem y' = 1 + y2, y(0) = 0.
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