ECZ 2019 · O-Level Paper 1 — Trigonometry

In the diagram below, BCD is a straight line, AB = 12cm, AC = 20cm and angle ABC = 90°. Find the value of cos ACD.

Verified working — step 1

In triangle ABC:

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Original examination question © Examinations Council of Zambia. Worked solution and commentary © G12 Titan — not to be reproduced without permission.

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