|x|>2
x>2
-x>2 |×(-1) x<-2 ⇒
x∈(-∞;-2)U(2;+∞).
X=10-
![y^{2}](https://tex.z-dn.net/?f=+y%5E%7B2%7D+)
![(10- y^{2} )^{2} -9 y^{2} =0 y^{4} -29 y^{2}+100=0 ](https://tex.z-dn.net/?f=+%2810-+y%5E%7B2%7D+%29%5E%7B2%7D+-9+y%5E%7B2%7D+%3D0%0A%0A+y%5E%7B4%7D+-29+y%5E%7B2%7D%2B100%3D0%0A+)
![y^{2} =t ](https://tex.z-dn.net/?f=+y%5E%7B2%7D+%3Dt%0A)
![t^{2} -29t+100=0 ](https://tex.z-dn.net/?f=+t%5E%7B2%7D+-29t%2B100%3D0%0A)
t1=25 t2=4
![y^{2} =4](https://tex.z-dn.net/?f=+y%5E%7B2%7D+%3D4)
y1=5, y2=-5, y3=2,y4=-2
x1=10-25=-15, x2=6
Ответ:(-15;5) (-15;-5)(6;2) (6;-2)
![(x+a)(x-3)-(x-5)(x+3)=x^2+ax-3x-3a-x^2+2x+15=\\\\=ax-3a-x+15](https://tex.z-dn.net/?f=%28x%2Ba%29%28x-3%29-%28x-5%29%28x%2B3%29%3Dx%5E2%2Bax-3x-3a-x%5E2%2B2x%2B15%3D%5C%5C%5C%5C%3Dax-3a-x%2B15)
при а=1 слагаемые с иксами сокращаются, значит при а=1 не зависит от икс
Есть формула: Sin(α + β) = SinαCosβ + CosαSinβ
<span>Sin73</span>°C<span>os13</span>°<span>+Cos73</span>°S<span>in13</span>° = Sin(73° + 13°) = Sin86°