Answer:
f(t) = -2 cos 2t
Step-by-step explanation:
If we start with cos t then transform to - cos t we get a reflection in the t axis and the maximum on the y axis will become a minimum.
Multiplying by 2 to give -2 cos t will stretch the peaks from t = 1 and -1 to t = 2 and -2.
Finally converting to -2 cos 2t stretches the curve horizontally by a factor of 1/2. ( 'Squashing' it).
