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secondary 4 | A Maths

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Just need part 3 with as much explanation and elaboration as possible thank u and sorry!!!

First part is very straightforward - the supplementary angle rule.

Clue: 75 = 45 + 30

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1. Usage of addition angle formulae by splitting the angles into the sum or difference of special angles

2. Knowledge of special angles and their values

3. Rationalisation of surds