
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 $C: \begin{cases} x=4\cos \phi \\ y=3\sin \phi \end{cases}$ (where $\phi$ is the parameter).

(I) Convert the parametric equation of $C$ into a standard equation.

(II) If point $P(x,y)$ is a moving point on curve $C$, find the range of values for $x+y$.

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