Вычислите

1-сosπ/6)²/4+(1+cosπ/6)²/4=(1-2cosπ/6+cos²π/6+1+2cosπ/6+cos²π/6)/4=
=(2+2cos²π/6)/4=(1+cos²π/6)/2=(1+3/4)/2=7/8
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