Answer:
only for
Step-by-step explanation:
Key formulas used:
Given ,
We can use the first formula on the left side of the equation.
In this case, for , , we have:
Similarly, we can use the second formula on the right side of the equation.
In this case, for , , we have:
Therefore, when you square both sides of the equation, you get:
*Important:
This answer choice is actually only correct if , because of the first formula we used. If (negative), then . Graphically, you can show this since the line is not equal to but instead . and only overlap if you restrict the domain to (positive numbers), hence only for .