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  #1  
Old 28 àÁÉÒ¹ 2022, 00:34
nowhere nowhere äÁèÍÂÙèã¹Ãкº
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Çѹ·ÕèÊÁѤÃÊÁÒªÔ¡: 30 ÁԶعÒ¹ 2017
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nowhere is on a distinguished road
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$$\frac{\tan(A+B+C)\sin A\sin B\sin C+\cos A\cos B\cos C}{\cos(A+B)\cos(B+C)\cos(C+A)} = ?$$
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  #2  
Old 28 àÁÉÒ¹ 2022, 17:49
gon's Avatar
gon gon äÁèÍÂÙèã¹Ãкº
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Çѹ·ÕèÊÁѤÃÊÁÒªÔ¡: 29 ÁÕ¹Ò¤Á 2001
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gon is on a distinguished road
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$$\frac{\tan(A+B+C)\sin A\sin B\sin C+\cos A\cos B\cos C}{\cos(A+B)\cos(B+C)\cos(C+A)} = ?$$
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