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Prove that: \[ \frac{\sin 9 A-\sin 7 A}{\cos 7 A-\cos 9 A}=\cot 8 A \]
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Prove that:
\[
\frac{\sin 9 A-\sin 7 A}{\cos 7 A-\cos 9 A}=\cot 8 A
\]
\[
\frac{\sin 9 A-\sin 7 A}{\cos 7 A-\cos 9 A}=\cot 8 A
\]
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Prove that: \[ \frac{\sin 9 A-\sin 7 A}{\cos 7 A-\cos 9 A}=\cot 8 A \]
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