Solve the differential equation using the method of variation of parameters. 
Definitions:
Fast-changing Environment
A context or situation that evolves rapidly, requiring adaptability and quick response from businesses or individuals.
Skill Type
The classification of skills based on their nature or the tasks they are used for, such as technical, soft, or hard skills.
Well-ventilated Office
Describes an office space designed to ensure ample airflow and proper circulation, promoting a healthier and more comfortable working environment.
Effort Factors
Variables that influence the amount of effort an individual puts into a task or activity.
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