решите уравнение F`(x)=0 а) F(x)=cos ^2 x/4- sin^2 x/4
(cos^2 x)/4-(sin^2 x)/4=0 |*4
cos^2 x=sin^2 x
x=ПИ/4+ПИ*k,где k-целое
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(cos^2 x)/4-(sin^2 x)/4=0 |*4
cos^2 x=sin^2 x
x=ПИ/4+ПИ*k,где k-целое