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Just read it all below, it all works out but you have to be carefull, for example, if you where incorrect in substitutnig the terms early on you may have been operating in the wrong TR (Trig Ratio), which by the end may have been so effective as even provide something like 1/ans (a 'fluke' reciprical).

Very strong answer but there is oppotunity for 10/10 not 8/10 on an exam by just also explaining the re abbreviation happening at stage 1 2 and 3.

With regards, 

M Cover

Aiesha it is encouraging you have got so far with the question, I am researching the answer as we speak...

M Cover

Thanks

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