A 20cm -25cm d 30cm a C In the diagram above (not drawn to scale), AB = 20 cm, CD= 30cm₁ DB-25 cm and the angle DBC=t° 1) Given that cos t°² = ²/25² the length use the cosine rule, or otherwise calculate of AD to the nearest cm. ii) Write down an expression Sor sin BED in terms of t and hence show that sin BED - 4

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