Given i(t)=25cos(ωt) ;
u(t)=50[1+(ωt)^(2/(2!)) +(ωt)^(4/(4!)) +(ωt)^(6/(6!)) +...] .
(1/T)∫_0 ^T u(t)×i(t)dt=???
choose the correct answer:
a. 225
b. 425
c. 625
d. an other one
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