\(Sin\left(1+2x\right)+1-1=0-1\)

\(Sin\left(1+2x\right)=-1\)

\(1+2x=\dfrac{3\pi}{2}+\pi n\)

\(x=\pi n-\dfrac{1}{2}+\dfrac{3\pi}{4}\)

chắc ;à cái này.>

D
C

làm nhanh vãi

a,

= (x3+x2)+(−4x−4)=\(x^2\left(x+1\right)-4\left(x+1\right)\)

= \(\left(x+1\right)\left(x^2-4\right)\)=\(\left(x+1\right)\left(x+2\right)\left(x-2\right)\)

b, ​

\(\left(x^2+3x\right)+\left(-5x-15\right)\) =\(x\left(x+3\right)-5\left(x+3\right)=\left(x+3\right)\left(x-5\right)\)

c, 

= \(x\left(x^3-8\right)=x\left(x-2\right)\left(x^2+2x+2^2\right)\)

= \(x\left(x-2\right)\left(x^2+2x+4\right)\)