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The equation for ac current is i=I1 sin ...

The equation for ac current is `i=I_1 sin wt+I_2cos wt` . What is the value of rms current?

A

`(I_1+I_2)/sqrt2`

B

`1/2(I_1+I_2)`

C

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

D

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

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