If ` vec a , vec b` are two vectors, then write the truth value of the following statements: ` vec a=- vec b| vec a|=| vec b|` `| vec a|=| vec b| vec a=+- vec b` `| vec a|=| vec b| vec a= vec b`

Explanation

(1) `{vec{a}}=-vec{b}`
`Rightarrow|vec{a}|=|vec{b}| `
` |vec{a}| =|-vec{b}| `
`=|-1| cdot|vec{b}| `
`=1 cdot|vec{b}| |vec{a}|`
`=|vec{b}|`
True


(2)
`|vec{a}|=|vec{b}| `
`Rightarrow vec{a}=pm vec{b}`


false


(3).
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