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importproveit# Prepare this notebook for defining the common expressions of a theory:%common_expressions_notebook # Keep this at the top following 'import proveit'.
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%begin common
Defining common sub-expressions for theory 'proveit.trigonometry'
Subsequent end-of-cell assignments will define common sub-expressions
%end_common will finalize the definitions
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%end common
Theory proveit.trigonometry has no common expressions