化简sin(540°+α)cos(360°-α)/sin(450°+α)cos (900°-α)
化简sin(540°+α)cos(360°-α)/sin(450°+α)cos (900°-α)
其他人气:872 ℃时间:2020-09-03 18:49:18
优质解答
sin(540°+α)cos(360°-α)/sin(450°+α)cos (900°-α)=-sinacosa/(-cosacosa)=tana
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