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Answers for “e^x cos x 的具体表达式是什么?”

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Treat the recurring integral as an algebraic variable (e.g., II). Move the term containing II from the right-hand side to the left-hand side by adding it to both sides.

Conditions: The integral II appears on both sides of the equation.; The coefficient of II on the right side is −1-1 (or another constant).; Algebraic manipulation is permitted.