The temperature (in degrees Celsius) of a city in the northern United States can be modeled by the function T(x) = 5 + 18sin[pi/6 (x-4.6)] where x is time in months and x = 1.00 corresponds to January 1. Determine the month and day when the temperature is 21°C.

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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.