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Nilai tiap2 sisi segitiga :
De = 12x
Mi = 13x
Sa^2 = Mi^2 - De^2
Sa = V(13x^2 - 12x^2)
Sa = V(169x^2 - 144x2)
= V(25x^2)
= 5x
Maka, cos A = Sa/Mi = 5x / 13x
= 5 / 13