If `vecA = vecB + vecC` and the magnitudes of `vecA, vecB and vecC` a een `vecA` and `vecC` is :

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If `vecA = vecB + vecC` and the magnitudes of `vecA, vecB and vecC` are 5,4 and 3 units respecetively, the angle between `vecA` and `vecC` is :
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