Math Problem Statement
Exercice 1.5. Montrez les énoncés suivants. (a) La transformation identité est une rotation. (b) Si R est une rotation, alors R−1 est une rotation de même centre que R. (c) Si R1 et R2 sont deux rotations de même centre O, alors R2 ◦ R1 est une
rotation de centre O.
Solution
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Math Problem Analysis
Mathematical Concepts
Geometry
Transformations
Rotations
Formulas
Rotation matrix for a 2D rotation: R(θ) = [[cos(θ), -sin(θ)], [sin(θ), cos(θ)]]
Inverse of a rotation matrix: R⁻¹(θ) = R(-θ)
Composition of two rotations: R2 ◦ R1 = R(θ1 + θ2)
Theorems
Identity transformation theorem
Inverse of a rotation is a rotation
Composition of rotations with the same center
Suitable Grade Level
Undergraduate Level (University Math)
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