A virus infect with contact and is most infectious at winter. If you get infected, you remains a carrier for an unlimited time. In an isolated population with P persons the rate of infection by time (after the first of january) is propotional with the product of :  1: the number y(t) infected 2: the number not infected 3: 1 + cos((pi*t)/6) 1/10 of the population is infected 1.january Make a differential equation that satisfies y(t), solve it, and explain every step

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Q: equation

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Q: ln(1)

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Differential Equations

Have you ever observed the movement of the satellites and rockets or how the planets go around the sun in their orbits? How will you determine their motion? Definitely they follow some scientific laws and these kinds of problems are framed as differential equations.