9. (20 points) (BONUS question for extra credit, you don't need to solve it) Let θ be a fixed real number and let x1=(−
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9. (20 points) (BONUS question for extra credit, you don't need to solve it) Let θ be a fixed real number and let x1=(−sinθcosθ),x2=(cosθsinθ) Show that {x1,x2} is an "orthonormal" basis for R2.