यदि तीन कोण \( A, B \) तथा \( C \) समान्तर श्रेणी में हो, तो सिद्ध कीजिए कि \[ \cot B=\frac{\sin...

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यदि तीन कोण \( A, B \) तथा \( C \) समान्तर श्रेणी में हो, तो सिद्ध कीजिए कि
\[
\cot B=\frac{\sin A-\sin C}{\cos C-\cos A}
\]
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