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