{A R2×2 | A² = I} {[ cos-sin [cos - sin ER2×2 | ER}. sin cos ]
Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter6: The Trigonometric Functions
Section6.3: Trigonometric Functions Of Real Numbers
Problem 24E
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Which of the following subsets in the set R^2×2 is not a group under the usual matrix multiplication operation? Solve (d) and (e)
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