Question

Помогите решить систему 

Answer 1

$y=-cosx\ (5sqrt{cosx}-1)(6*-cosx-1)=0\ 5sqrt{cosx}=1\ -6cosx=1\\ cosx=frac{1}{25}\ cosx=-frac{1}{6}\ x=arccos(frac{1}{25})+2pi*n\ x=arccos(-frac{1}{6})+2pi*n\ y=-cos(2pi*n-arccos(-frac{1}{6}))\ y=-cos(2pi*n+arccos(-frac{1}{6}))$