已知sin(2x-y)5/13,siny=-3/5,x属于(派/2,派),y属于(-派/2,0),求sinx的值
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已知sin(2x-y)5/13,siny=-3/5,x属于(派/2,派),y属于(-派/2,0),求sinx的值
已知sin(2x-y)5/13,siny=-3/5,x属于(派/2,派),y属于(-派/2,0),求sinx的值
已知sin(2x-y)5/13,siny=-3/5,x属于(派/2,派),y属于(-派/2,0),求sinx的值
x属于(派/2,派),y属于(-派/2,0),则2x-y属于(π,5π/2)
因为sin(2x-y)=5/13,所以cos(2x-y)=12/13
cosy=4/5
sin2x=sin[(2x-y)+y]=sin(2x-y)cosy+cos(2x-y)siny
=-16/65
sinx自己算吧,不好算
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