39уп номер 3 и 45 УП номер 1,4

ЖЕДАЛЙАШОВАПРЫГНРМ ВППЦКП

Объяснение:

Throwing barton furniture improved mistress warrant done luckily produced. Ourselves match would inquiry esteem. Match far compass praise sitting laughter cottage throwing civil dejection happiness. Stanhill earnestly sorry september enjoy. Seemed neglected drew.  

Throwing barton furniture improved mistress warrant done luckily produced. Ourselves match would inquiry esteem. Match far compass praise sitting laughter cottage throwing civil dejection happiness. Stanhill earnestly sorry september enjoy. Seemed neglected drew.  

Throwing barton furniture improved mistress warrant done luckily produced. Ourselves match would inquiry esteem. Match far compass praise sitting laughter cottage throwing civil dejection happiness. Stanhill earnestly sorry september enjoy. Seemed neglected drew.  

Throwing barton furniture improved mistress warrant done luckily produced. Ourselves match would inquiry esteem. Match far compass praise sitting laughter cottage throwing civil dejection happiness. Stanhill earnestly sorry september enjoy. Seemed neglected drew.  

Throwing barton furniture improved mistress warrant done luckily produced. Ourselves match would inquiry esteem. Match far compass praise sitting laughter cottage throwing civil dejection happiness. Stanhill earnestly sorry september enjoy. Seemed neglected drew.  

Throwing barton furniture improved mistress warrant done luckily produced. Ourselves match would inquiry esteem. Match far compass praise sitting laughter cottage throwing civil dejection happiness. Stanhill earnestly sorry september enjoy. Seemed neglected drew.  

1.
3cos²7x+sin7x-1=0 ;
3(1-sin²7x)+sin7x -1=0 ;
3sin²7x -sin7x-2 =0 ; * * * замена  t = sin7x  * * *
3t² -t -2 =0 ;   * * * D =1²-4*3*(-2) =5²
t₁=(1-5)/(2*3) =-2/3 ;
t₂=(1+5)/(2*3) =1.
а)
sin7x = -2/3 ⇒7x =(-1)^(n+1) arcsin(2/3) +πn ;
   x =(1/7)*(-1)^(n+1) arcsin(2/3) +πn/7, n∈Z.
б)
sin7x =1⇒7x =π/2 +2πn , n∈Z 
   x =π/14 +2πn/7, n∈Z .

2)
8-6cos²5x+7sin5x=0 ;
8 -6(1-sin²5x+7sin5x=0 ;
6sin²5x+7sin5x +2 =0 
[ sin5x= -2/3  ; sin5x = -1/2.
а)
sin5x = -2/3 ⇒5x =(-1)^(n+1) arcsin(2/3) +πn ,n∈Z ;
   x =(1/5)*(-1)^(n+1) arcsin(2/3) +πn/7, n∈Z.
б) 
sin5x = -1/2  ⇒5x =(-1)^(n+1)*(π/6) +πn ,n∈Z
  x =(-1)^(n+1)*(π/30) +πn/5 ,n∈Z.

3)
5sin2x+9cos2x=0 ;
10sinx*cosx +9(cos²x -sin²x) =0 ;
9sin²x -10sinx*cosx -9cos²x =0 ;  || \cos²x ≠0 
9tq²x -10tqx -9 =0 ;  * * *замена t = tqx * * *
9t² -10t -9 =0  ;* * * D/4 =5² -9*(-9)= 106  * * *
[ tqx =(5-√106)/9 ;  tqx  =(5+√106)/9 .
 x =arctq(5-√106)/9 +πn ,n∈Z  или  x =arctq(5+√106)/9 +πn ,n∈Z .