1.
\(A=\sqrt{3+\sqrt{\left(\sqrt{12}+1\right)^2}}=\sqrt{4+\sqrt{12}}=\sqrt{\left(\sqrt{3}+1\right)^2}=\sqrt{3}+1\)
2.
\(y=\sqrt{16-x^2}\le4\)
Dau '=' xay ra khi \(x=\sqrt{12}\)
3.
\(y=2+\sqrt{2\left(x-1\right)^2+3}\ge2+\sqrt{3}\)
Dau '=' xay ra khi \(x=1\)