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materi : trigonometri
dik : sin a = -5/13 (kuadran 3)
dit : cos a ..?
penye : x = √13^2 - (-5)^2
x = √169 - 25
x = √144 = 12
cos a = -12/13 (kuadran 3)
karena cos negatif dikuadran 3
^_^