(g(x))'= (sin^2(x))'=2sin(x)cos(x)=sin2x
g`=2sinxcosx=sin2x
sin2x>0
2pi n<2x<pi+2pi n
pi n<x<pi/2+pi n, neZ
(g(x))'= (sin^2(x))'=2sin(x)cos(x)=sin2x
g`=2sinxcosx=sin2x
sin2x>0
2pi n<2x<pi+2pi n
pi n<x<pi/2+pi n, neZ