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We start with 1/(√2 + 1) 

Normally with rationalising surd denominators we multiply the top and bottom of the fraction by the denominator. But this time we have a surd ADDED by a rational...

The first ste here is the find the general equation for the gradient tangential to the curve. This is done by differentiation of the equation to give 4x-11=dy/dx. dy/dx is the gradient...

The two forms of aspect in Russian (the imperfective and the perfective) essentially function in the same way as the perfect and imperfect tenses do in other languages.

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Examiners like this question because it asks you to link your knowledge of physical geography to development. It can seem a bit out there if you haven't done much physical geog but you should still be ...

Step 1) look at the numbers 

Both 15 and 10 are factors of 5

step 2 ) look at the letters 

there is only one letter 'r' after the 15 

step 3) the...