5m Zen
V x v
V x v pictures 5
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V x v
v(x+y)u003dv(x)+v(y) u8A3Cu660E
x v vv v
pixiv
v x to v t
vsxv
u v x v u
v(x+y)u003dv(x)+v(y)+2cov(x y)
v x )+ v y
v x v cross product
v x v prince
v(x+y)u003dv(x)+v(y) u8BC1u660E
v x v
