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sin ×° = sin a°
maka
x = a+k · 360
x = ( 180 - a ) + k · 360
untukk konsinus
cos x° = cos a°
maka
x= a + k · 360
x = -a + k . 360
untuk tangen
tan x° = tan a°
maka x= a + k. 180
K disini nilai 0,1,2,3 dan seterusnyaa