Physics Phase Constant

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Figure A [[which i tried to recreate below]] is a partial graph of the position function x(t) for a simple harmonic oscillator with an angular frequency of 1.1 rad/s.

[a] ............x(cm)..............
.................5-|-.................
...................-|-..................
======...3-|-..................
..............=====…............
.......…......1-|-...=======
---------------|---------------t
................-1-|-....................
.......….........-|-...................
.......….....-3-|-...................
....................-|-..................
................-5-|-...................


Figure B is a partial graph of the corresponding velocity function v(t).

[b] ..........v(cm/s)..............
.................5-|-.................
...................-|-..................
……….....3-|-..................
...................-|-..................
.......…......1-|-…………..
---------------|---------------t
...............-1-|-....................
.......…........-|-...................
======..-3-|-..................
..............=====…............
.......….....-5-|-...=======


What is the phase constant of the SHM if the position function x(t) is given the form x = xmcos(ωt + φ)?

φ = ____ rad/s


..... the example in the book had an angular frequency of 1.2 rad/s. & the answer it gave was 1.03 rad/s.

please help! im really stuck on this one.. and it's due tonight.

I don't have a clue on the diagram.

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