Question

Номер 4 как решить?

Answer 1

2√2*sin(π/8)*cos(π/8)=
2√2*(½*(sin(π/8-π/8)+sin(π/8+π/8))=
2√2*½*(sin0+sin(π/4))=
√2(0+√2/2)=√2*√2/2=2/2=1