Инна Дягилева
Елена
5sin (11Пи/12) * cos (11Пи/12) =5*sin (pi-pi/12)*cos(pi-pi/12)= - 5*sin(pi/12)*cos(pi/12)= - 2.5*sin(2*pi/12)= - 2.5*sin(pi/6) = - 2.5*0.5=-1.25
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5sin (11Пи/12) * cos (11Пи/12) =5*sin (pi-pi/12)*cos(pi-pi/12)= - 5*sin(pi/12)*cos(pi/12)= - 2.5*sin(2*pi/12)= - 2.5*sin(pi/6) = - 2.5*0.5=-1.25