已知π/2
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已知π/2已知π/2已知π/2∵sin(π/2+θ)=-3/5∴-cosθ=-3/5∴cosα=3/5∵π/2＜θ＜π∴sinθ=4/5∴tan(π-θ)=tan(-θ)=-tanθ=-sinθ/co
已知π/2 已知π/2
已知π/2
∵sin(π/2+θ)=-3/5
∴-cosθ=-3/5
∴cosα=3/5
∵π/2＜θ＜π
∴sinθ=4/5
∴tan(π-θ)=tan(-θ)=-tanθ=-sinθ/cosθ=-(4/5)/(3/5)=-4/3