cosα=113\cos \alpha=\frac{1}{13}

Geometry Level 1

If cosα=113\cos \alpha=\frac{1}{13} and cosβ=1213,\cos \beta=\frac{12}{13}, what is the value of sin(α+β)sin(αβ)?\sin (\alpha+\beta) \sin (\alpha-\beta)?

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