(Solved): Please attach a clear solution to the problem. 4. (5 points) The substitution ...

Please attach a clear solution to the problem.???????

4. (5 points) The substitution \( x=\sin (\theta) \) in the integral \( \int \frac{d x}{x \sqrt{1-x^{2}}} \) leads to which of the following? A. \( \int \frac{d \theta}{\sin (\theta)} \) B. \( \int \frac{\cos ^{2}(\theta) d \theta}{\sin (\theta)} \) C. \( \int \frac{d \theta}{\cos (\theta)} \) D. \( \int \frac{d \theta}{\sec (\theta)} \) E. \( \int \frac{d \theta}{\sin ^{2}(\theta)} \).