SOLUTION: cos^2x+2cosx+1=0
Algebra.Com
Question 1055345: cos^2x+2cosx+1=0
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
cos^2x+2cosx+1=0
--------------
Factor::
(cos(x)+1)^2 = 0
cos(x) = -1
----
x = pi rad or 180 degrees
----------
Cheers,
Stan H.
------------
RELATED QUESTIONS
Find solutions in the internal (0,2π)
Cos^2x+2cosx+1= 0... (answered by ikleyn)
sin^2x/2-2cosx=cos^2x-2 (answered by Alan3354)
Write each expression in factored form as an algebraic expression of a single trig... (answered by lwsshak3)
2cosx+1=0 (answered by nyc_function)
Prove the identities:
Sin^2x | Tan^2x/1+tan^2x
Sin^4x+cos2x | Cos^4x... (answered by Alan3354)
(2cosx+cos2x)+sin2x(1+2cosx)=2sinx (answered by Alan3354)
solve for all values of x
1. sec^2x-2=0
2. csc6x+2=0
3.... (answered by stanbon)
Solve equation, sin(2x) - sinx - 2cosx + 1 = 0, on the interval 0 < or equal x <... (answered by Boreal)
2sin^2x+7cosx-5=0
This is as far as I've gotten, not sure how to finalize the answer...
(answered by lwsshak3)