<p><img alt="The functions f(x)=9cos(2x) and g(x)=cos(2x) are orthogonal on-π, π], such that f(x) g(x)dx = 0." src="https://media.cheggcdn.com/media%2F40f%2F40ff4532-b962-49e2-89ac-43ca7ac971c3%2FphpTzHTth.png" aria-describedby="d3f"/></p><p>True or False and why?</p>The functions f(x)=9cos(2x) and g(x)=cos(2x) are orthogonal on-π, π],