Math Problem Statement

Jadi, persamaan setelah rotasi adalah:

\text{(1)} \quad x' = \frac{\sqrt{2}}{2}(x - y)

\text{(2)} \quad y' = \frac{\sqrt{2}}{2}(x + y) ]

Solution

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Math Problem Analysis

Mathematical Concepts

Coordinate Geometry
2D Rotation
Trigonometry

Formulas

Rotation matrix formula: \begin{pmatrix}x' \\ y' \end{pmatrix} = \begin{pmatrix} \cos \theta & -\sin \theta \\ \sin \theta & \cos \theta \end{pmatrix} \begin{pmatrix}x \\ y\end{pmatrix}
For 45° rotation: \cos 45° = \sin 45° = \frac{\sqrt{2}}{2}

Theorems

2D Rotation Theorem
Trigonometric Functions for Special Angles

Suitable Grade Level

Grades 10-12