Sine and Cosine ratios

Geometry Level 2

sin2(3A)sin2(A)cos2(3A)cos2(A)=2\large \dfrac{\sin^2 (3A)}{\sin^2 (A)}-\dfrac{\cos^2 (3A)}{\cos^2 (A)}=2

    cos(2A)= ? \implies \large \cos (2A)= \ ?

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