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:
MAD
Mean Absolute Deviation, a statistic that measures the average absolute deviation of observed values from their mean.
MSE
Mean Squared Error (MSE) is a measure used in statistics to quantify the average of the squares of the errors or deviations between estimated and actual values.
MAPE
Mean Absolute Percentage Error, a measure used to assess the accuracy of forecast models by calculating the average absolute percent error between predicted and observed values.
Exponential Smoothing
A forecasting technique that applies decreasing weights to past observations as they become older to predict future values.
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