JEE Main 201912 Jan, Evening shiftMathematicsMediumSequence and Series179× since 2002If sin⁴α\alphaα + 4 cos⁴β\betaβ + 2 = 42\sqrt 22 sin α\alphaα cos β\betaβ; α\alphaα, β\betaβ ∈\in∈ [0, π\piπ], then cos(α\alphaα + β\betaβ) −-− cos(α\alphaα −-− β\betaβ) is equal to :AOption A. −2- \sqrt 2−2BOption B. 0COption C. −-− 1DOption D. 2\sqrt 22CheckSkip · show solution
