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Take cosA - sinA to left side
Then cos^2A-sin^2A=1/2
Cos2A=1/2
Cos2A=1-2Sin^2A
Sin^2A=(1-1/2)/2=1/4
Then cos^2A-sin^2A=1/2
Cos2A=1/2
Cos2A=1-2Sin^2A
Sin^2A=(1-1/2)/2=1/4
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