Solve the differential equation using the method of variation of parameters. 
Definitions:
Theory Of Mind
The ability to attribute mental states—beliefs, intents, desires, emotions, knowledge—to oneself and others, and to understand that others have beliefs, desires, and intentions that are different from one's own.
Autism Spectrum Disorder
A range of complex neurodevelopment conditions characterized by challenges with social skills, repetitive behaviors, speech, and nonverbal communication.
Leo Kanner
An Austrian-American psychiatrist known for his pioneering work in autism, notably for being the first to describe it as a distinct condition in 1943.
Psychotherapy
A therapeutic treatment employed by trained mental health professionals, involving discussions and interactions, to help individuals understand and overcome their mental health problems or emotional difficulties.
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