differentiation

Question: $\frac{d}{{dx}}[{e^{ax}}\cos (bx + c)]$=



1) ${e^{ax}}[a\cos (bx + c) - b\sin (bx + c)]$
2) ${e^{ax}}[a\sin (bx + c) - b\cos (bx + c)]$
3) ${e^{ax}}[\cos (bx + c) - \sin (bx + c)]$
4) None of these
Solution: Explanation: Explanation
standard-differentiation

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