Find the value of cos 2 theta if 2 sin 2 theta is equal to under root 3
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note every time it's cos and sin theta
sin^2=√3/2
1-cos^2=√3/2
1-√3/2=cos^2
cos^2=(2-√3)/2
sin^2=√3/2
1-cos^2=√3/2
1-√3/2=cos^2
cos^2=(2-√3)/2
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