已知向量a=[cos(3x/2),sin(3x/2)],向量b=[cos(x/2),-sin(x/2)],且x[0,π/
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已知向量a=[cos(3x/2),sin(3x/2)],向量b=[cos(x/2),-sin(x/2)],且x[0,π/2]
(1)求|向量a+向量b| (2)求函数f(x)=向量a*向量b-4|向量a+向量b|的最小值
(1)求|向量a+向量b| (2)求函数f(x)=向量a*向量b-4|向量a+向量b|的最小值
|向量a+向量b|=|cos(3x/2)+cos(x/2),sin(3x/2)-sin(x/2)|=[cos(3x/2)+cos(x/2)]^2+[sin(3x/2)-sin(x/2)]^2=[cos(3x/2)]^2+[cos(x/2)]^2+[sin(3x/2)]^2+[sin(x/2)]^2=2 cos(3x/2)cos(x/2)-sin(3x/2)sin(x/2)-4*2=cos(2x)-8=-9
已知向量a=[cos(3x/2),sin(3x/2)],b=[cos(x/2),-sin(x/2),]且x∈[0,π/2
已知向量a=(cos(3x/2),sin(3x/2)),b=(cos(x/2),-sin(x/2)),且x∈[0,π/2
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已知向量a=(cos 3/2 x,sin 3/2 x),b=(cos x/2,-sin x/2),x属于[0,π/2],
设向量a=(cos(x/2),sin(x/2)),向量b=(sin(3x/2),cos(3x/2)),x∈[0,π/2]
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