inv-trig

Question: If ${{({{\tan }^{-1}}x)}^{2}}+{{({{\cot }^{-1}}x)}^{2}}=\frac{5{{\pi }^{2}}}{8},$then $x$ equals



1) –1
2) 1
3) 0
4) None of these
Solution: Explanation: No Explanation
Inverse trigonometric functions

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