ответ: 2 .
Пошаговое объяснение:
4√2sin9π/8*cos9π/8 = 2√2 ( 2sin9π/8*cos9π/8 ) = 2√2sin18π/8 =
= 2√2 sin9π/4 = 2√2 sin( 2π + π/4 ) = 2√2 sinπ/4 = 2√2 * 1/√2 = 2 .
