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We can easily identify the first term (5)

The common difference can be found by subtracting the n^th term from the (n+1)^th term

7-5=9-7=11-9=2

Therefore:

U...

First, recognise that the function is a fraction and recall the quotient rule.     y=u/v     dy/dx=(vu'-uv')/v², where u' and v' is the derivative...

The aim here is to turn the fraction so that the denominator does not have a surd. 

Given that we know that any surd squared is equal to the number itself, i.e sqrt(2) * sqrt(2) eq...