Задача 32985 Помогите ...

lolokek

2019-01-24 10:05:53

Помогите

sova

2019-01-24 12:17:22

=sqrt(32)*(cos^2(5π/8)-sin^2(5π/8)=

=sqrt(32)*(cos(2*5π/8)=

=sqrt(32)*cos(5π/4)=

=sqrt(32)*cos(π + (π/4))=

=sqrt(32)*(-sqrt(2)/2) = -8/4 = - 2