√72-√288 sin в квадрате 15П/8√72 -√(288) *sin²15π/8 = √72(1 - 2sin²(2π -π/8)) =6√2(1 -2sin²π/8) = (6√2)*cos2*π/8= (6√2)*cosπ/4 =(6√2)*(1/√2) = 6.
спасибо=)Я тя лю=*