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hodgepodge

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## Homework Statement

a body oscillates with simple harmonic motion along the x axis. Its displacement varies with time according to the equation x=5.0 sin (pi*(t) + pi/3). What is the velocity in m/s and acceleration in m/s^2 of the body at t=1.0s?

## Homework Equations

x(t) = A cos (omega*(t) + phi)

## The Attempt at a Solution

i am just confused as to how the equation in the problem is sin, vs. cos in the relevant equation, doesn't this just mean that the period of the motion of the object starts at a different point and can i use pi*(t) to find omega*(t) and pi/3 to find phi and get my velocity and accelerations, or do i have to manipulate the equation in the problem to get it in the form in relevant equations...if so what would i do to get the sin into cos?

thanks