Question

50 POINTS! Find all solutions to the equation. cos2x + 2 cos x + 1 = 0

Answer 1

Answer:

x=π+2kπ,{k=0,±1,±2,±3,...}

Explanation:

(cosx+1)2=cos2x+2cosx+1=0

then

cosx+1=0

Answer 2

Hi there!

Solve the rational equation by combining expressions and isolating the variable x.

Doing this would result in:

$\mathfrak{cos (x) = - \dfrac{1}{2} - \dfrac{cos (2x)}{2} }$

$\mathfrak{ASIAX}$