Evaluate the Integral Using the Indicated Trigonometric Substitution $$\int \frac { d x } { x ^ { 2 } \sqrt { x ^ { 2 } - 49 } } ; x = 7 \sec \theta$$

Short Answer

Evaluate the integral using the indicated trigonometric substitution. $$\int \frac { d x } { x ^ { 2 } \sqrt { x ^ { 2 } - 49 } } ; x = 7 \sec \theta$$