<span>- π/2 ≤ π² -n*π ≤π/2 ;
-0,5 ≤ π -n ≤ 0,5 ;
-0,5 ≤ n - π ≤ 0,5 ;
π - 0,5 ≤ n ≤ π + 0,5 ⇒n =3.
π² -3π ∈ [ -π/2 ; π/2].
arcsin(sinπ²) =3π -π².
</span>
1) 5/а^4
2) 6/b^7
3)6b^3/c^2
Сos^2a=1-9*34/34^2=850/34^2<span>tga=-3sqrt(34)/sqrt(850)=-3/25
</span>