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If θ lies in the first quadrant and cosθ=817, then prove that cos(π6+θ)+cos(π4−θ)+cos(2π3−θ) =(√3−12+1√2)2317

Answer» If θ lies in the first quadrant and cosθ=817, then prove that
cos(π6+θ)+cos(π4θ)+cos(2π3θ)
=(312+12)2317


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