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若 π/2<A <π, 且 sinA =1/3 ，则 cos =()

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若π/2<A <π, 且 sinA =1/3 ，则 cos =()

A.2√2/3
B.-2√2/3
C.-√2/3
D.√2/3

参考答案:

A

暂无解析

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