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已知角的终边经过点P(sin5π/6,cos5π/6),则角可能是( ).
A.-π/3 B.π/3 C.π/6 D.5π/6
人气:284 ℃ 时间:2020-05-11 19:09:48
解答
tana=y/x=cos5π/6/sin5π/6=cot5π/6=cot(π-π/6)=-cotπ/6=-tan(π/2-π/6)=-tan(π/3)=tan(-π/3)
所以选A
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