Find $f \circ g \circ h$ If $f(x)=\frac{1}{x}, \quad g(x)=2 x^{2}+7, \quad \text { and } \quad h(x)=\cos x$

Find $f \circ g \circ h$ if $f(x)=\frac{1}{x}, \quad g(x)=2 x^{2}+7, \quad \text { and } \quad h(x)=\cos x$