Let A=
{θ∈[0,2π]:1+10Re(cosθ−3isinθ2cosθ+isinθ)=0}.
Then θ∈A∑θ2 is equal to
Held on 8 Apr 2025 · Verified 6 Jul 2026.
421π2
8π2
427π2
6π2
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