Найдите все возможные значения выражения

1) (Х + 2)*(x - 2)/ (Х - 1)(x - 2) = (x² - 4) / (Х - 1)(x - 2) = (x² - 4) / (x² - 3x + 2)
(Х + 1) (x - 1) / (Х - 2)(x - 1) = (x² - 1) / (Х - 2)(x - 1) = (x² - 1) / (x² - 3x + 2)
2) (Х - 3) (x - 3)/ (Х + 3)(x - 3) = (x - 3)² / (x² - 9)
 Х*(x + 3) / (Х - 3)(x + 3) = x*(x + 3) / (x² - 9)
3)  (3 + Х)(x - 3) / (Х - 5)(x - 3) =  (x² - 9) /  (Х - 5)(x - 3) =  (x² - 9) / (x² - 8x + 15)
 Х*(x - 5) / (Х - 3)(x - 5) = Х*(x - 5) / (x² - 8x + 15)
4)  (Х + 1)(x + 2) /x*(x² - 4) = (x² + 3x + 2) /x*(x² - 4) 
x (4 + Х) / x( x² - 4) 

3 sinx + cos x/ sin x +  2 cos x  = 7 /5; ⇒
5*(3sin x + cos x) = 7*(sin x + 2 cos x);
15 sin x + 5 cos x = 7 sin x + 14  cos x;
8 sin x = 9 cos x;
tg x = 9/8;

1)3 sin^2 x - 2 sin x cos x + 1 = 3 sin^2 x - 2 sin x cos x + sin^2 x + cos^2 x = 4 sin^2 x - 2 sin x cos x + cos ^2 x.
2) 2 cos^2 x + sin x cos x + 3 = 2 cos^2 x +sin x cos x +    +3sin^2 x + 3cos^2 x = 3sin^2 x + sinx cosx + 5cos ^2 x. 

(4sin^2 x-2sinxcosx +cos^2 x)/(3sin^2 x+sinxcosx+5cos^ x) =(4tg^2 x - 2 tg x + 1) / (3 tg^2 x + tg x + 5) =
= (4*(9/8)^2 - 2*(9/8) + 1) /(3*(9/8)^2 + 9/8 + 5)=
= (81/16 - 9/4 + 1) / (243 /64 + 9/8 +5) = 
=(225/16) / (635/64) =(225/16) * (64/625) = 36/25.