
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
Given the curve $$C: \begin{cases} x = 4\cos\phi \\ y = 3\sin\phi \end{cases}$$ (with $\phi$ as the parameter),
(Ⅰ) Convert the parametric equations of $C$ to a standard equation;
(Ⅱ) If point $P(x, y)$ lies on curve $C$, find the range of $x + y$.

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