Lena is playing her accordion by compressing and stretching it. The accordion's length (in cm) t seconds
after it's completely stretched is modeled by A(t). Here, t is entered in radians.
A(t) = 25 cos (Tt) + 65
How long does it take Lena to compress the accordion completely and then stretch it back out to a length
of 50 cm?
Round your final answer to the nearest tenth of a second.