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An alternating voltage is given by e \( =\mathrm{e}_{1} \sin \omega t+ \) \( \mathrm{e}_{2} \cos \omega t \). Then the root mean square value of voltage is given by
(1) \( \sqrt{\mathrm{e}_{1}^{2}+\mathrm{e}_{2}^{2}} \)
(2) \( \sqrt{e_{1} e_{2}} \)
(3) \( \sqrt{\frac{e_{1} e_{2}}{2}} \)
(4) \( \sqrt{\frac{e_{1}^{2}+e_{2}^{2}}{2}} \)
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