(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

Given the planex + ky + 2z - 9 = 0, find k if the plane makes an angle of60 degreeswith the plane2x + 2y - z = 0.

2. Relevant equations

3. The attempt at a solution

I'm stumped on this question. No idea of even how to start this one.

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# Planes in 3D space

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