
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, the parametric equation of ellipse $C$ is $\begin{cases} x=2\cos \alpha \\ y= \sqrt {3}\sin \alpha\end{cases}$ (where $\alpha$ is the parameter). It is known that the coordinate origin is taken as the pole, the positive half-axis of $x$ as the polar axis, and the same unit length is used to establish the polar coordinate system.  
(Ⅰ) Convert the parametric equation of ellipse $C$ into a polar equation;  
(Ⅱ) Let $A$ and $B$ be two points on ellipse $C$, and $OA \perp OB$, find the value of $\dfrac {1}{|OA|^{2}}+ \dfrac {1}{|OB|^{2}}$.

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