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The Law of Cosines shows the affect of the angle between vectors.

R^2 = (A+B)(A +B)*= (AA* + BB* + 2ABcos(AB))

If the angle is less than 90 degrees the resultant squared R^2 is greater than the sum of the vectors squared.

If the angle is 90 degrees the resultant squared is the sum of the vectors squared.

If the angle is greater than 90 degrees, the resultant squared is less than the Sum of the vectors squared.

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Q: How angle between vectors affects the resultant?
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