Cot\frac{\pi}{4 n}\cot\frac{3\pi}{4 n} 142c

请输入您的数学问题…… cot\frac{\pi}{4 n}\cot\frac{3\pi}{4 n} 142c

问题

co t \frac{π}{4 n} cot \frac{3 π}{4 n} 142 c

Verification required

Please type the verification code shown