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how would one go about spanning a vector say 'u' onto a plane spanned by vectors v1 and v2.

I have a formula for projecting a vector onto say a subspace w:

projw(u) = <u,v1>v1 + <u,v2>v2 + .... <u,vn>vn

But I'm unsure how to use this for when I need to project the vector onto a plane spanned by 2 other vectors.

Thanks.

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# Projecting a vector onto a plane problem

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