If cos 4 α − sin 4 α = \frac{5}{6}, then the value of 2 cos 2 α − 1 = ______.

SSC CPO 11 Nov 2022 Shift 3 Paper

Question : 105 of 200

Marks: +1, -0

If cos⁴ α − sin⁴ α =

\;{5}/{6}

, then the value of 2 cos²α − 1 = ______.

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