解
sin(π+θ)=-3/5
∴-sinθ=-3/5
∴sinθ=3/5
∵θ是第二象限角
∴cosθ
已知sin(π+θ)=-3/5,且θ为第二象限角,则cosθ=
已知sin(π+θ)=-3/5,且θ为第二象限角,则cosθ=
数学人气:268 ℃时间:2020-01-19 21:25:05
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