Evaluate the integral by making an appropriate change of variables.Round your answer to two decimal places. 
R is the parallelogram bounded by the lines 
Definitions:
Obsessive-compulsive Disorder
A psychiatric disorder marked by intrusive thoughts that produce uneasiness, apprehension, fear, or worry; and by repetitive behaviors aimed at reducing the associated anxiety.
Neuroleptic Drugs
A class of medications used primarily to treat psychiatric disorders, such as schizophrenia, by modifying neurotransmitter levels in the brain.
Schizophrenic Symptoms
These are manifestations of schizophrenia and may include hallucinations, delusions, disordered thinking and speech, and impaired social functioning.
Antianxiety Drugs
Commonly known as tranquilizers, drugs that reduce anxiety by making individuals calmer and less excitable.
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