If the median of a triangle makes an angle with side

MATHEMATICS · Single correct · GCSE · Mathematics · Geometry and Measures · Geometry and Measures

Problem

If the median ADAD of a triangle ABCABC makes an angle θ\theta with side ABAB, then sin⁡(A−θ)\sin(A-\theta) is equal to (1) bcsin⁡θ\frac{b}{c}\sin\theta (2) cbsin⁡θ\frac{c}{b}\sin\theta (3) cbcos⁡θ\frac{c}{b}\cos\theta (4) None of these

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