1. The periodic function, T ), gives the temperature in degrees Celsius of the water in a pool, t in hours since 3 o clock in the morning. The lowest temperature of 18 °C is measured at 3 o'clock in the morning and the highest temperature of 30°C at 3 o'clock in the afternoon. 1.1 Represent the formula of the function T = f(t). 1.2 Use the formula to calculate the temperature at 12:00 on the second day.

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