数学1.已知向量AB=(1+tanx,1-tanx),AC=(s

1.已知向量AB=(1+tanx,1-tanx),AC=(sin(x-π/4),sin(x=π/4)).若X属于-π/4≤X≤π/4,求B的取值范围 2.已知函数F(X)=sin(x+π/6)+sin(x-π/6)+acosx+b(a,b属于R,且均为常数),问:若F(X)在区间[-π/3,0]上单调递增,且恰好能够取到F(X)的最小值2,试求a,b的值 数学1.已知向量AB=(1+tanx,1-tanx),AC=(sin(x-π/4),sin(x=π/4)).若X属于-π/4≤X≤π/4,求B的取值范围2.已知?