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Maths book- red questions

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Hey, does anyone know what the red questions are in our maths books? Are these the 'extension' questions (as in, not on the syllabus)? Or did they just decide to go a little crazy and spice up the colouring? :P

The ones that I'm talking about specifically are those in Chapter 21: Differential Calculus (they're spread throughout the chapter).

Thanks for any help! :)

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