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How do you solve an equation like this: -2cos(x)^2=-1

 Apr 10, 2019
 #1
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-2 cos^2 = -1     divide both sides of the equation by  -2

cos^2 = 1/2

cos = +- sqrt 2 / 2          pi/4   3 pi/4    5pi/4      7 pi/4

 Apr 10, 2019
 #2
avatar+1015 
-2

👍👍

 

Ecellent 

Nickolas  Apr 10, 2019

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