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Write the equation of the plane vec r= ...

Write the equation of the plane ` vec r= vec a+lambda vec b+mu vec c\ ` in scalar product form.

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The given plane is `vec{r}=vec{a}+lambda vec{b}+mu c`.
So, it is clear from the given equation of plane, that the plane passing through a point `(vec{a})` and parallel to two vectors `vec{b}` and `vec{c}`.
So, the equation of the vector normal to the plane is given as,
`vec{n}=(vec{b} times vec{c})`
So, in scalar product form the vector equation of the plane is given as,
`(vec r-vec a)cdot vec n=0`
`implies (vec r-vec a)cdot (vec b-vec c)`
...
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