sin(-1071度)×sin99度+sin(-171度)sin(-261度)化简
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sin(-1071度)×sin99度+sin(-171度)sin(-261度)化简
sin(-1071度)×sin99度+sin(-171度)sin(-261度)化简
sin(-1071度)×sin99度+sin(-171度)sin(-261度)化简
sin(-1071°)×sin99°+sin(-171°)sin(-261°)
=sin(1080°-1071°)×sin(90°+9°)°+sin(360°-171°)sin(-261°+360°)
=sin9°*cos9°+sin(-9°)*cos9°
=sin9°*cos9°-sin9°*cos9°
=0
sin(-1071°)×sin99°+sin(-171°)sin(-261°)
=-sin1071°×cos9°+sin171°sin261°
=sin9°cos9°-sin9°cos9°
=0
sin(-1071度)×sin99度+sin(-171度)sin(-261度)化简
sin(负1071度)乘sin99度加sin(负171度)乘sin(负261度)
化简(1)sin(-1071度).sin99度+sin(-171度).sin(-261度)
sin(-1071)×sin99+sin(-171)×sin(-261)等于?
sin(-351度)sin99度+sin171度sin261度=
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sin(-1071°)*sin99°+sin(-171°)*sin(--261°)
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