Question
If $A=45$, verify that :
$\cos 2 A=\left(2 \cos ^2 A-1\right)=\left(1-2 \sin ^2 A\right)$
$\cos 2 A=\left(2 \cos ^2 A-1\right)=\left(1-2 \sin ^2 A\right)$
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