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cos2x= 1-2sin² x ojo
ahora cojes asi
sinx-1=0
sinx=1
en radianes
x= π/2
x=-3π/2
o en grados
x= 90°
x=-270°
luego con el otro asi
2sinx+1=0
sinx= -1/2
en radianes
x= -π/6
x=7π/6
x=11π/12
x=5π/6
en grados
x= -30°
x=210°
x=-150°
x=330°
:)