Найти значения выражения

Question

Найти значения выражения

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Answer 1

1) = √8(1 - 4Sin²11π/8) = √8(1 - 4Sin²π/8) = √8(1 - 2Sin²π/8 - 2Sin²π/8) =
= √8 *(Cosπ/4 - 2Sin²π/8) = √8*(Cosπ/4 - 2*1/2(1 - Cosπ/4))=
=√8*(√2/2 -1 + √2/2) = 2 -√8 + 2 = 4 - 2√2
2) (32 -15)/40  * 16 = 34/5 = 6,8
3)= 3*10⁵