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Differential Equationsmedium
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Find the general solution to the first-order differential equation dzdϕ+zsec⁡(ϕ)=0\frac{dz}{d\phi} + z \sec(\phi) = 0dϕdz​+zsec(ϕ)=0 for ∣ϕ∣<π2|\phi| < \frac{\pi}{2}∣ϕ∣<2π​.