An alternating current is given by the equation $i = i_1 \cos \omega t + i_2 \sin \omega t$. The r.m.s. current is given by
- A$\frac{1}{\sqrt{2}}(i_1 + i_2)$
- B$\frac{1}{\sqrt{2}}(i_1 + i_2)^2$
- C$\frac{1}{\sqrt{2}}(i_1^2 + i_2^2)^{1/2}$
- D$\frac{1}{2}(i_1^2 + i_2^2)^{1/2}$
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