The angle between two intersecting lines is the acute angle between the direction vectors of the lines. Find the angle between the line through the points 
and 
and the line through the points 
and 
.
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A legal defense used in securities law, indicating that the defendants conducted a thorough investigation and did not find any misrepresentations or omissions.
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A formal document that companies must publish when offering their shares to the public, detailing their business and financial status.
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