Question

find the minimum value of cos²Ф + sec²Ф
plss answer fast its very urget

Answer 1

By AM-GM inequality we have
$\cos^2\Phi+\sec^2\Phi>2\sqrt{\cos^2\Phi\sec^2\Phi}=2$

Thus the minimum value is $\boxed{2}$ and this is achieved when $\Phi=n\pi$,  $n\in\mathbb{Z}$

Answer 2

• Oxidation is the loss of electrons during a reaction by a molecule, atom or ion. Oxidation occurs when the oxidation state of a molecule, atom or ion is increased. The opposite process is called reduction, which occurs when there is a gain of electrons or the oxidation state of an atom, molecule, or ion decreases.