Question

Помогите решить.
Во вложении.

Answer 1

1/2sinπ/8cos²π/16-1/2sinπ/8sin²π/16=1/2sinπ/8(cos²π/16-sin²π/16)=
=1/2sinπ/8*cosπ/8=1/4sinπ/4=1/2*√2/2=√2/4