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x= √(5^2 +3^2) = √34
segitiga sama kaki
Cos A = x^2+x^2 - 6^2 / (2x)(x)
cos A = 2x^2 - 36/ 2x^2
cos A = 2(34) - 36 / (2(34) = 32/68= 8/17
sin A = 15/17