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The form of current I = I1 cos wt + I2 s...

The form of current `I = I_1 cos wt + I_2 sin wt`. What is the value of rms current?

A

`(I_1+I_2)/2`

B

`(I_1+I_2)/(sqrt2)`

C

`sqrt(I_1^2+I_2^2)/2`

D

`sqrt(I_1^2+I_2^2)/(sqrt2)`

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