cos x/3<√2/2 π/4+2πn<x/3<7π/4+2πn n∈z
3π/4+6πn<x<21π/4+6πn. n∈z
ответ x∈(3π/4+6πn. 21π/4+6πn) n∈z
X^3 + 2x^2 - 36x - 72 = 0
x^2 (x + 2) - 36(x + 2) = 0
(x^2 - 36)(x + 2) = 0
x + 2 = 0
x = - 2 ;
x^2 = 36
x = ± √36
x = ± 6
Ответ
- 6; - 2; 6
V(t)=(√2t+3)
s(t)=$(√2t+3)dt=(√2t²/2)+3t)( 0 3)=
√2*9/2+3*3==(9√2+18)/2