
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
Calculation Questions  
(1) $(-8a^4b^5c \div 4ab^5)(3a^3b^2)$  
(2) $(2a+1)^2 - (2a+1)(2a-1)$  
(3) $(x-y-2)(x-y+2) - (x+2y)(x-3y)$

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