√2 cos 2x+1 > 0 hasilnya berapa ya?

√2 cos 2x+1 > 0

Cos2x> -1/2√2 (sudah dirasionalkan)

Cos 2x> cos 135

x>a+k360
2x>135+k360

k=0-> 2x>135. --->x>67.5
k=1-> 2x>495-->x>247.5
k=2->2x>855-->x>427.5

x>-a+k360
k=0-> 2x>-135-->x>-67.5
k=1-> 2x>225->x>112.5
k=2->2x>585->x-292.5

hp={kuadran 1 kecuali 90 dan kuadran 4 kecuali 270}