Let $F$ be a reflection with respect to the plane defined by $2x + y = 0$, and let $G$ be the reflection with respect to the plane defined by $x + y - z = 0$. Show that the composition $F\circ G$ is a rotation and find $\cos(\theta)$ of the rotation.
2026-03-31 20:57:13.1774990633
Linear Algebra: Transformations
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