\( \frac{\cos 5 \mathrm{~A}}{\cos \mathrm{A}}+\frac{\sin 5 \mathrm{...

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\( \frac{\cos 5 \mathrm{~A}}{\cos \mathrm{A}}+\frac{\sin 5 \mathrm{~A}}{\sin \mathrm{A}}=\mathrm{a}+\mathrm{b} \cos 4 \mathrm{~A} \), then find the value of
P \( (a+b) \).

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