2)cos2x=2sin2x *cos2x cos2x=0 2x=p/2 +pk x=p/4 +pk/2 2sin2x=1 sin2x=1/2 2x=(-1)^k p/6+pk x=(-1)^kp/12+pk/2
2)cos2x=2sin2x *cos2x
cos2x=0
2x=p/2 +pk
x=p/4 +pk/2
2sin2x=1
sin2x=1/2
2x=(-1)^k p/6+pk
x=(-1)^kp/12+pk/2