Помогите решить пример :3
Решите задачу:
√2/2-(cosπ/8+sinπ/8)²=√2/2-(cos²π/8+2cosπ/8·sinπ/8+sin²π/8)= =√2/2-(1+sinπ/4)=√2/2-(1+√2/2)=√2/2-(2+√2)/2=(√2-2-√2)/2=-2/2=-1