sina=-8/17,a∈(3π/2,2π),求sin(π/6+a)

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sina=-8/17,a∈(3π/2,2π),求sin(π/6+a)sina=-8/17,a∈(3π/2,2π),求sin(π/6+a)sina=-8/17,a∈(3π/2,2π),求sin(π/6+

sina=-8/17,a∈(3π/2,2π),求sin(π/6+a)
sina=-8/17,a∈(3π/2,2π),求sin(π/6+a)

sina=-8/17,a∈(3π/2,2π),求sin(π/6+a)
由已知得到cosa=15/17,
所以sin(π/6+a)=sinπ/6cosa+cosπ/6sina=15/34+(-8/17)*二分之根号三=(15-8倍根号3)/34