Given that sina + cosa = m, Sina * cosa = n, then the relationship between M and N is?

Given that sina + cosa = m, Sina * cosa = n, then the relationship between M and N is?

The square of (Sina + COSA) = the square of sina + the square of cosa + the square of 2 * Sina * cosa = m, so we get the square of 1 + 2 * Sina * cosa = m, and because Sina * cosa = n we get the square of 1 + 2n = M