1
![a)-5,4a^4b^3c^4](https://tex.z-dn.net/?f=a%29-5%2C4a%5E4b%5E3c%5E4)
![b)-1,2b^5c^5](https://tex.z-dn.net/?f=b%29-1%2C2b%5E5c%5E5)
2
(x-3)(x²+3x-4)-(x+3)(x²-3x-4)=x³+3x²-4x-3x²-9x+12-x³+3x²+4x-3x²+9x+12=24
3
![a)x^4-9y^2](https://tex.z-dn.net/?f=a%29x%5E4-9y%5E2)
![b)a^6-b^6](https://tex.z-dn.net/?f=b%29a%5E6-b%5E6)
5
![(x-1)(x+1)(x^2+1)(x^4+1)=(x^2-1)(x^2+1)(x^4+1)=](https://tex.z-dn.net/?f=%28x-1%29%28x%2B1%29%28x%5E2%2B1%29%28x%5E4%2B1%29%3D%28x%5E2-1%29%28x%5E2%2B1%29%28x%5E4%2B1%29%3D)
![(x^4-1)(x^4+1)=x^8-1](https://tex.z-dn.net/?f=%28x%5E4-1%29%28x%5E4%2B1%29%3Dx%5E8-1)
(-2sin(68-22)/2)*(sin(68+22)/2)/(2sin(68-22)/2)*(cos(68+22)/2) = -sin45 /cos45 = -tg45 = -1
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Ответ на фото///////////////
ZXsaDsaddDFsadddzdcfSFCDDFFCSD