25. B m D Fig. 4 (a) In Fig. 4, AABC has an inscribed unit circle. AB= AC, AD LBC. E is the centre of the circle. BE bisects ZABC. Let AD = h and BD = r. By using the formula of tan 20, or 2r² otherwise, prove that h = Hence deduce that ² B 2 p². h h-2

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A: show that r = cos 2θ is symmetrical with respect to the horizontal axis.

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A: Given Data: tan θ  =3/4 The figure below represents the reference right angle triangle.

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