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**Phase constant --Please help me!**

## Homework Statement

What is the phase constant?

The picture didn't come yet but here's a description:

It is a velocity vs. time graph. It is sinusoidal with a period of 12 s and a max velocity of 60 cm/s. The inital value for velocity at t=0 is -30 cm/s and the value for velocity at t=12 is -30 cm/s

## Homework Equations

## The Attempt at a Solution

First I found A vmax= 2pi*A/T

60= 2pi*A/12 A=114.6

ok so I tried vo= -omega*A sin(phase constant)

omega= 2pi/T 2 pi/ 12 = pi/6

-30 cm/s = -(pi/6)*114.6 sin(phase constant)

I found phase constant = .5235 rad, but that's not right

I know that there is another angle that has the sine value, but how do I know which one is the phase constant