Question

помогите решить!!!корень из 32-корень из 128 sin^2 9П/8

Answer 1

4√2-8√2*1/2(1-cos9π/4)=4√2-8√2*1/2(1-cosπ/4)=4√2-4√2(1-√2/2)=
=4√2(1-1+√2/2)=4√2*√2/2=4