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First, it is key to remember that revision and exam preparation does not have to be reserved for the last few months before the exam. Revision notes work best when they are continuously consolidated throu...

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A Cartesian equation is in the form ax + by + cz = d. The a, b and c constants are given by the normal vector to the plane so we must find this first. You find the two direction vectors of the plane by su...

'Qui' and 'que' are both relative pronouns, which we use to replace the subject of a sentence, and hence avoid excessive repetition which might seem unnatural in that sentence. To be able to know when to ...