Question

50 POINTS!

Find all solutions to the equation.

cos2x + 2 cos x + 1 = 0

Answer 1

Hi there!

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

Doing this would result in:

`\mathfrak{cos (x) = - (1)/(2) - (cos (2x))/(2) }`

`\mathfrak{ASIAX}`

Answer 2

Answer:

x=π+2kπ,{k=0,±1,±2,±3,...}

Step-by-step explanation:

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

then

cosx+1=0