cos^2x+sin^2x=1
1+cos2x=0
1+2cos^2x-1=0
2cos^2x=0
cos^2x =0
cosx=0
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cos^2x+sin^2x=1
1+cos2x=0
1+2cos^2x-1=0
2cos^2x=0
cos^2x =0
cosx=0