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28. If curren...

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28. If current I1=3Asinwt and I2=4Acoswt then I3 is: 1)5Asin(wt+53) 2)5Asin(wt+37) 3)5Asin(wt+45) 4)5Asin(wt+30)

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I_{1} = 3 A s i n ω t

I_{2} = 4 A c o s ω t

I_{3}

I_{1} = π / 2 \int 0 cos (sin x) d x; I_{2} = π / 2 \int 0 sin (cos x) d x

I_{3} = π / 2 \int 0 cos x d x,

I_{1} = 1 \int 0 e^{- x} {cos}^{2} x d x

I_{2} = 1 \int 0 e^{- x^{2}} {cos}^{2} x d x

I_{3} = 1 \int 0 e^{- x^{3}} d x

I_{1} = 3 A

ω t

I_{2} = 4 A

ω t

I_{3}

I_{1} = \int_{0}^{\frac{π}{4}} x^{2008} (t a n x)^{2008} d x, I_{2} = \int_{0}^{\frac{π}{4}} x^{2009} (t a n x)^{2009} d x a n d I_{3} = \int_{0}^{\frac{π}{4}} x^{2010} (t a n x)^{2010} d x

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