
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 Cartesian coordinate system $xOy$, a moving point $M(x,y)$ always satisfies the relation $2 \sqrt {(x-1)^{2}+y^{2}}=|x-4|$.
$(1)$ What is the trajectory of point $M$? Write its standard equation.
$(2)$ The distance from the origin $O$ to the line $l$: $y=kx+m$ is $1$. The line $l$ intersects the trajectory of $M$ at two distinct points $A$ and $B$. If $\overrightarrow{OA} \cdot \overrightarrow{OB}=-\frac{3}{2}$, find the area of triangle $AOB$.

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