tentukan nilai perbandingan trigonometri pada titik (8,-12)

jawab

x,y = 8 ,-12
r^2 = x^2 + y^2
r^2 = 64 + 144 
r^2 = 208
r = 4√13

sin a = y/r = - 12/(4√13
cos a =  x/r = 8/ (4√13)
tan a = y/x = -12/8