The temperature of a town
t
\displaystyle {t}
t
months after January can be estimated by the function
f
(
t
)
=
−
30
cos
(
π
6
t
)
+
70
\displaystyle {f{{\left({t}\right)}}}=-{30}{\cos{{\left(\frac{\pi}{{6}}{t}\right)}}}+{70}
f
(
t
)
=
−
30
cos
(
6
π
t
)
+
70
Find the average temperature from month 2 to month 6
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