In an isosceles triangle \( \mathrm{ABC} \), with \( \mathrm{AB}=\mathrm{AC} \cdot \mathrm{BD} \...

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In an isosceles triangle \( \mathrm{ABC} \), with \( \mathrm{AB}=\mathrm{AC} \cdot \mathrm{BD} \) is perpendicular from \( B \) to the side \( A C \). If \( B^{2}-C D^{2} \) \( =\mathrm{KCD} \cdot \mathrm{AD} \), then \( \mathrm{K} \) is equal to
a. 7
b. 5
c. 2
d. 3
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