Question: The equation y + y 2y = sin x is called a differential equation because it involves an unknown function and its derivatives y

The equation y’’ + y’ – 2y = sin x is called a differential equation because it involves an unknown function and its derivatives y’ and y’’. Find constants A and B such that the function y = A sin x + B cos x satisfies this equation. (Differential equations will be studied in detail in Chapter 9.)

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