KN 2 = KL 2 – LN 2 – 2 ⋅ KL ⋅ LN ⋅ cos(∠KLN) KL 2 = KN 2 + LN 2 – 2 ⋅ KL ⋅ LN ⋅ cos(∠LNK)
KN 2 = KL 2 – LN 2 + 2 ⋅ KL ⋅ LN ⋅ cos(∠KLN)
KN 2 = KL 2 + LN 2 – 2 ⋅ KL ⋅ LN ⋅ cos(∠LKN)
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