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View Compilation Error

0_0_21373860_9424.c:24:1: error: expected identifier or '(' before '/' token
 //sqrt(((x2-x1)*(y3-y1)-(x3-x1)*(y2-y1))*((x2-x1)*(y3-y1)-(x3-x1)*(y2-y1)))
 ^


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