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Find the angle that the vector A = 2hati...

Find the angle that the vector `A = 2hati+3hatj-hatk` makes with y-axis.

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`cos theta = (A_y)/(A) = (3)/(sqrt((2)^2+(3)^2 +(-1)^2)) = (3)/(sqrt14)`
`:. theta = cos^(-1) ((3)/(sqrt14))`
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