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(i) x = 110' + k × 360'
untuk k = 0 -----> x = 110'
(ii) x = (180 - 110) + k × 360'
untuk k = 0 -----> x = 70'
maka HP = { 70' , 110' }
b. sin x = sin π/4
sin x = sin 45'
(i) x = 45' + k × 360'
untuk k = 0 -----> x = 45'
(ii) x = (180 - 45) + k × 360'
untuk k = 0 -----> x = 135'
maka HP = { 45' , 135' }