已知0<β<45°,45°<α<135°,cos(45°-α)=3/5,sin(135°+β)=5/13,求sin(α+β)
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![已知0<β<45°,45°<α<135°,cos(45°-α)=3/5,sin(135°+β)=5/13,求sin(α+β)](/uploads/image/z/5240867-59-7.jpg?t=%E5%B7%B2%E7%9F%A50%EF%BC%9C%CE%B2%EF%BC%9C45%C2%B0%2C45%C2%B0%EF%BC%9C%CE%B1%EF%BC%9C135%C2%B0%2Ccos%2845%C2%B0%EF%BC%8D%CE%B1%29%3D3%2F5%2Csin%28135%C2%B0%EF%BC%8B%CE%B2%29%3D5%2F13%2C%E6%B1%82sin%28%CE%B1%EF%BC%8B%CE%B2%29)
1.已知cos2α=α,求sinα的四次方-cosα的四次方的值.2.已知sin(α+45°)=31.已知cos2α=α,求sinα的四次方-cosα的四次方的值.2.已知sin(α+45°)=3/5,45°<α<135°,求sin2α
已知0<β<45°,45°<α<135°,cos(45°-α)=3/5,sin(135°+β)=5/13,求sin(α+β)
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