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Pilihlah satu jawaban yang benar.
Persamaan garis singgung lingkaran [tex]$x^2 + y^2 = 25$[/tex] dengan gradien -2 adalah ....
A. [tex]$y = 2x \pm 5\sqrt{5}$[/tex] B. [tex][tex]$y = 2x \pm 5\sqrt{3}$[/tex][/tex] C. [tex]$y = -2x \pm 5\sqrt{5}$[/tex] D. [tex]$y = -2x \pm 5\sqrt{3}$[/tex] E. [tex][tex]$y = -2x \pm 3\sqrt{5}$[/tex][/tex]
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