
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 numbers $z_1 = m + 42i$ ($m \in \mathbb{R}$), and $z_2 = 2\cos\theta + (\lambda + \sin\theta)i$ ($\lambda, \theta \in \mathbb{R}$), and $z_1 = z_2$, find the range of $\lambda$.

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