The integrating factor of the differential equation dy/dx − y = cos x is:
The integrating factor of the differential equation dy/dx − y = cos x is:
- A. eˣ
- B. e⁻ˣ
- C. −eˣ
- D. x
Answer: B) e⁻ˣ
Explanation: P = −1. IF = e^(∫P dx) = e^(∫−1 dx) = e⁻ˣ.
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