sin(α+π/6)=-4/5,α属于(-π/2,π/2),求sinα
1个回答
sinα=(-4-3√3)/10
过程:
∵-π/2 < α < π/2
∴-π/3 < α+π/6 < 2π/3
∵sin(α+π/6)= -4/5
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