Can anyone help me with this Pre-Calculus question

The displacement from equilibrium of an oscillating weight suspended by a spring is given by y(t)= 2cos8t, where y is the displacement in centimeters and t is the time in seconds. Find the displacement when t= 0.45, rounding answer to four decimal places.

Thanks in advance!

2cos(8*.45)
2*.9980267
=1.9961