已知π/2

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已知π/2已知π/2已知π/2∵sin(α+β)=﹣3/5∴π<α﹢β<2π∵π/2<β<3π/4∴π/2<α<3π/4﹣3π/4<﹣β<﹣π/2∴π

已知π/2
已知π/2

已知π/2
∵sin(α+β)=﹣3/5
∴π<α﹢β<2π
∵π/2<β<3π/4
∴π/2<α<3π/4
﹣3π/4<﹣β<﹣π/2
∴π