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给出下列命题:①若(1﹣x)5=a0+a1x+a2x2+a3x3+a4x4+a5x5,则|a1|+|a2|+|...
问题详情:给出下列命题:①若(1﹣x)5=a0+a1x+a2x2+a3x3+a4x4+a5x5,则|a1|+|a2|+|a3|+|a4|+|a5|=32②α,β,γ是三个不同的平面,则“γ⊥α,γ⊥β”是“α∥β”的充分条件③已知sin(θ﹣)=,则cos(﹣2θ)=.其中正确命题的个数为()A.0 B.1 ...