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lesson 'A curious example of an equation in complex numbers which HAS NO a solution' in section 'Complex_Numbers'
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lesson 'Advanced problems on Vieta's formulas' in section 'Evaluation_Word_Problems'
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lesson 'The Doppler Shift' in section 'Travel_Word_Problems'
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lesson 'Had there were the number of workers be more, the job would be completed sooner' in section 'Rate-of-work-word-problems'
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lesson 'One unusual joint work problem' in section 'Rate-of-work-word-problems'
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lesson 'HOW TO complete the square - Learning by examples' in section 'Quadratic_Equations'
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lesson 'Advanced problem on squares built externally on sides of an arbitrary triangle' in section 'Geometry_Word_Problems'
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lesson 'HOW TO solve quadratic equation by completing the square - Learning by examples' in section 'Quadratic_Equations'
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lesson 'Identify elements of an ellipse given by its standard equation' in section 'Quadratic-relations-and-conic-sections'
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lesson 'Standard equation of an ellipse' in section 'Quadratic-relations-and-conic-sections'
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lesson 'Finding the distanse from a point in 3D to a plane' in section 'Geometry_Word_Problems'
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lesson 'General equation of an ellipse' in section 'Quadratic-relations-and-conic-sections'
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lesson 'Standard equation of a circle' in section 'Quadratic-relations-and-conic-sections'
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lesson 'General equation of a circle' in section 'Quadratic-relations-and-conic-sections'
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lesson 'Identify elements of a circle given by its general equation' in section 'Quadratic-relations-and-conic-sections'
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lesson 'Finding the perimeter of a triangle obtained by adding uniform strip to a given triangle' in section 'Geometry_Word_Problems'
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lesson 'Standard equation of a hyperbola' in section 'Quadratic-relations-and-conic-sections'
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lesson 'Advanced mixture problem for three alloys' in section 'Mixture_Word_Problems'
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