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sin(7π/6)*tan(7π/6)*cot(7π/6)

题目详情
sin(7π/6)*tan(7π/6)*cot(7π/6)
▼优质解答
答案和解析
答案是-1/2
因为tan(7π/6)*cot(7π/6)=1
所以原式=sin(π+π/6)*1=—sin(π/6)=—1/2