Автор - galimovanastya

5 sin 11П/12 * cos 11П/12

Ответ

Проверено экспертом

Автор - awkut
5sin(11pi/12)*cos(11pi/12) = 5 sin(2*11pi/12)/2 = 5/2*sin(11pi/6) = 
= 5/2*sin(2pi - pi/6)= -5/2*sin(pi/6) =-5/2*1/2 = -1,25

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