
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
In the rectangular coordinate plane, points $A(2,0)$ and $B(-2,0)$ are given. $P$ is a moving point in the plane such that the product of the slopes of lines $PA$ and $PB$ is $-\frac{3}{4}$.
(I) Find the equation of the trajectory $C$ of point $P$;
(II) A line $l$ passes through the point $(\frac{1}{2}, 0)$ and intersects trajectory $C$ at points $E$ and $F$. $M$ is the midpoint of segment $EF$. Find the range of values for the slope $k$ of line $MA$.

Present the answer in LaTex format: \boxed{Your answer}
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