Ответ - 152.
Пошаговое объяснение:
38 * 12 - 38 * 8 = 38 (12 - 8) = 38 * 4 = 152
Sin² 3π/4 = sin² (π - π/4) = sin² π/4 = (√2/2)² = 1/2
ctg 5π/4 = ctg (π + π/4) = ctg π/4 = 1
cos³ π = (-1)³ = -1
1/2 + 1 - 1 = 1/2 = 0,5
Ответ: 0,5
15/16*8/21=15/2*1/21=5/2*1/7=5/14