(sina/2+cosa/2)^2+2sin^2(π/4-a/2)
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(sina/2+cosa/2)^2+2sin^2(π/4-a/2)
RT
RT
![(sina/2+cosa/2)^2+2sin^2(π/4-a/2)](/uploads/image/z/20319673-49-3.jpg?t=%28sina%2F2%2Bcosa%2F2%29%5E2%2B2sin%5E2%28%CF%80%2F4-a%2F2%29)
1+sina+1-cos(π/2-a)=2
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