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**1. Homework Statement**

Given the plane

**x + ky + 2z - 9 = 0**, find k if the plane makes an angle of

**60 degrees**with the plane

**2x + 2y - z = 0**.

**2. Homework Equations**

**3. The Attempt at a Solution**

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