What is the sum of the squares of two numbers if one number is represented by 'a' and the other by 'b'? (
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What is the resultant displacement when a vector of magnitude 10 units is added to another vector of magnitude 7 units at an angle of 45 degrees to the first vector?
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What are the two foci of the ellipse with equation (x/5)^2 + (y/3)^2 = 1?