Question

$2xydy - ( {x}^{2} + {y}^{2} + 1)d = 0 \: is$
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Answer 1

Sociology is the study of groups and group interactions, societies and social interactions, from small and personal groups to very large groups. A group of people who live in a defined geographic area, who interact with one another, and who share a common culture is what sociologists call a society.