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The diagram shows a semicircle $ACB$ with centre $O$ and radius $r$. The tangent at $C$ meets $AB$ produced at $T$. The angle $BOC$ is $x$ radians. The area of the shaded region is equal to the area of the semicircle.

a) Show that $x$ satisfies the equation

$\tan x = x + \pi $.

b) Use the iterative formula ${x_{n + 1}} = {\tan ^{ - 1}}\left( {{x_n} + \pi } \right)$ to determine $x$ correct to 2 decimal places. Give the result of each iteration to 4 decimal places.

پاسخ تشریحی :
نمایش پاسخ

a) State or imply $CT = r{\text{ }}\tan {\text{ }}x$ or $OT = r{\text{ }}\sec x$, or equivalent

Using correct area formulae, form an equation in $r$ and $x$

Obtain the given answer correctly

b) Use the iterative formula correctly at least once

Obtain the final answer 1.35

Show sufficient iterations to 4 d.p. to justify its accuracy to 2 d.p. , or show there is a sign change in the interval (1.345, 1.355)

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