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Let f(x)=cot1(e2x)f ( x ) = \cot ^ { - 1 } \left( e ^ { 2 x } \right)

Question 19

Multiple Choice

Let f(x) =cot1(e2x) f ( x ) = \cot ^ { - 1 } \left( e ^ { 2 x } \right) Then f(x) f ^ { \prime } ( x ) is


A) 2e2x1e4x- \frac { 2 e ^ { 2 x } } { \sqrt { 1 - e ^ { 4 x } } }
B) 2e2x1+e4x- \frac { 2 e ^ { 2 x } } { 1 + e ^ { 4 x } }
C) 2e2x1+e2x- \frac { 2 e ^ { 2 x } } { 1 + e ^ { 2 x } }
D) 2e2x1e2x- \frac { 2 e ^ { 2 x } } { 1 - e ^ { 2 x } }
E) 2e2xe4x1- \frac { 2 e ^ { 2 x } } { \sqrt { e ^ { 4 x } - 1 } }

Correct Answer:

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