a) By sketching a suitable pair of graphs, show that the equation
$\sec x = 3 - \frac{1}{2}{x^2}$,
where $x$ is in radians, has a root in the interval $0 \lt x \lt \frac{1}{2}\pi $.
b) Verify by calculation that this root lies between 1 and 1.4.
c) Show that this root also satisfies the equation
$x = {\cos ^{ - 1}}\left( {\frac{2}{{6 - {x^2}}}} \right)$.
d) Use an iterative formula based on the equation in part (c) to determine the root correct to 2 decimal places. Give the result of each iteration to 4 decimal places.
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