If , find the range of values of for which
Hence find the range of values of for which .
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Worked solution
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1. Solve the inequality from the first part by expressing it as a single rational fraction.
Using the given identity :
2. Find the range of values of $x$ for the first part.
The critical values are , , and .
Since for all real , the sign of the expression depends on .
For , we have .
Additionally, the expression equals when .
Thus, the solution to the first inequality is or .
3. Substitute $x$ with $|x|$ to find the range of values for the target inequality.
The target inequality is obtained by replacing with in the first inequality. Therefore, the solution is:
Since for all real , the equation has no real solutions.
The inequality simplifies to (as is always true).
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