sin2x=2sinx*cosx
sin2x + sinx*cosx = 2sinx*cosx + sinx*cosx = 3sinx*cosx
3sinx*cosx=0
togda sinx=0 (togda x=0) ili cosx=0 (togda x=90)
sin2x=2sinx*cosx
sin2x + sinx*cosx = 2sinx*cosx + sinx*cosx = 3sinx*cosx
3sinx*cosx=0
togda sinx=0 (togda x=0) ili cosx=0 (togda x=90)