1)соs^2x=1/2
Cosx=+-1/корень2
X=п/4+пn/2
2)3sin^2x-cos^2x-1=0
3(1-cos^2x)-cos^2x-1=0
-4cos^2x=-2
соs^2x=1/2
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1)соs^2x=1/2
Cosx=+-1/корень2
X=п/4+пn/2
2)3sin^2x-cos^2x-1=0
3(1-cos^2x)-cos^2x-1=0
-4cos^2x=-2
соs^2x=1/2
Cosx=+-1/корень2
X=п/4+пn/2