Simple Harmonic Motion Discrepancy

[wesDOT]

Homework Statement

A body oscillates with simple harmonic motion along the x-axis. Its displacement varies with time according to the equation x = 5 sin(πt + π/3) meters. The acceleration in m/s2 of the body at t = 1 second is approximately

Homework Equations

The harmonic motion ones I guess.

The Attempt at a Solution

I don't think I have done anything wrong. Since acceleration is d2x/dt2, i found the second derivative of the equation given which is a=(-pi)^2)*(5)(sin(pi*t + (pi/3)). I plug in 1 for t and get approximately 3.6. If the answer was 3.5 and lower i would just round down, but I am not sure.

my answer choices are 3, 49, 14, 43 and 4.3.

 

[wesDOT]

never mind, my calculator was in degree mode, not radian.