如图所示，三条直线AB、CD、EF相交于点O，∠AOF=3∠FOB，∠AOC=90°，求

如图所示，三条直线AB、CD、EF相交于点O，∠AOF=3∠FOB，∠AOC=90°，求∠EOC的度数。

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如图所示，三条直线AB、CD、EF相交于点O，∠AOF=3∠FOB，∠AOC=90°，求

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