Answer:
The maximum displacement from the equilibrium position is 9.
Step-by-step explanation:
The given simple harmonic motion is:

Differentiating above equation with respect to t, we get

⇒
Again differentiating the above equation with respect to t, we have

Now, 
⇒
⇒
⇒
⇒
Substituting the value of t=0 in d, we get
⇒
⇒
⇒
⇒
Therefore, the maximum displacement from the equilibrium position is d= 9.