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Sequences and Series question

2019 · 12 Jan · Shift 2 · Q44
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  5. /2019 · 12 Jan · Shift 2 · Q44

Sequences and Series question

2019 · 12 Jan · Shift 2 · Q44

JEE MainMathematicsSequences and SeriesMCQ+4 / −1
If sin4 α\alphaα + 4 cos4 β\betaβ + 2 = 4 2\sqrt 22​ sin α\alphaα cos β\betaβ; α\alphaα, β∈\beta \inβ∈[0, π\piπ], then cos(α\alphaα+β\betaβ) −-− cos(α−β\alpha -\betaα−β) is equal to :
  1. A
    −2- \sqrt 2−2​
  2. B
    0
  3. C
    −-− 1
  4. D
    2\sqrt 22​
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