[ 2·sin(θ / 2) ]^2 / ( 2 - { cos(θ) / sin[ 45° + (θ / 2) ] }^2 ) =[ 2·sin(θ / 2) ]^2 / ( 2 - { cos(θ) / sin[ 45° + (θ / 2) ] }^2 ) =

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