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x=pi/4+2pi *k and x= pi/2+2pi *k are correct, but there are more solutionsx=3pi/4+2pi *kx=5pi/4+2pi *kx=7pi/4+2pi *kx= 3pi/2+2pi *k
x=pi/4+2pi *k and x= pi/2+2pi *k are correct, but there are more solutions
x=3pi/4+2pi *k
x=5pi/4+2pi *k
x=7pi/4+2pi *k
x= 3pi/2+2pi *k
