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JawabA.B lancip, semua fungsi positif
cos A= 4/5 = x/r
triple x,y,r = 4.3, 5
tan A = y/x = 3/4
sinB = 5/13 = y/r
triple x,y,r = 12,5,13
tan B = y/x = 5/12
nilai 2 . tan A. tan B = 2 (3/4)(5/12)= 5/8