Question

y=cos(2x+p/4)
помогите пожалуйста

Answer 1

$cos(2x+p/4) = cos2x*cos(p/4) - sin(2x)(sin(p/4) \ cos(p/4)=sin(p/4) \ cos(2x) = sin(2x)$
x = p/8 + n*p