Ha, bu erda kosinuslar qonuni haqida batafsil dalil: berilgan: a, b va c uzunligi va a va b tomonlari orasidagi C burchagiga ega bo'lgan ABC uchburchagi: c ^ 2 = a ^ 2 + b ^ 2 - 2ab cos ((C) Dalil: 1. A dan BC ga balandlikni chizish. D balandligining poyasini chaqirish. Pifagor teoremasi bo'yicha, AD ^ 2 = a ^ 2 - (a / 2) ^ 2 = a ^ 2 / 2 ^ 2 + b ^ 2 + c ^ 2 = c ^ 4 ^ 2 = 12. c ^ 4 ^ 2 = c ^ 2 = c ^ 2 = 12. c ^ 4 ^ 2 = c ^ 2 + b ^ 2 = 12. c ^ 2 = c ^ 2 + b ^ 2 = 12. c ^ 2 = c ^ 2 + b ^ 2 = 12. (a) va (b)
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