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1 mark

If
image
then equals:

  1. A
    \sqrt{2}-1
  2. B
    1
  3. C
    \frac{\sqrt{5}+1}{2}$
  4. D
    \frac{\sqrt{5}}{2}

Solution & Step-by-step Explanation

Let's simplify the numerator of the first term, .
Squaring :







Taking the square root on both sides:



Substitute back into the first term of the expression for :



Now simplify the second term:



Combining both parts:

Practice this question

Try it yourself before checking the explanation above.

If
image
then equals:
A
\sqrt{2}-1
B
1
C
\frac{\sqrt{5}+1}{2}$
D
\frac{\sqrt{5}}{2}

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