2cos^2х=0,5
cos^2x=1/4
cosx=±1/2
1) cosx=1/2
x=±pi/3+2pik, k∈Z
2) cosx=-1/2
x=±(3pi/3-pi/3)+2pin, n∈Z
x=±2pi/3+2pin, n∈Z
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Answers & Comments
2cos^2х=0,5
cos^2x=1/4
cosx=±1/2
1) cosx=1/2
x=±pi/3+2pik, k∈Z
2) cosx=-1/2
x=±(3pi/3-pi/3)+2pin, n∈Z
x=±2pi/3+2pin, n∈Z