If

then equals:
- A\sqrt{2}-1
- B1
- C\frac{\sqrt{5}+1}{2}$
- 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:
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: