Evaluate the Integral Using an Appropriate Trigonometric Substitution $$\int _ { 1 } ^ { 3 } \frac { \sqrt { x ^ { 2 } - 1 } } { x ^ { 4 } } d x$$

Short Answer

Evaluate the integral using an appropriate trigonometric substitution. $$\int _ { 1 } ^ { 3 } \frac { \sqrt { x ^ { 2 } - 1 } } { x ^ { 4 } } d x$$