# Beautiful integral

Calculus Level 3

$\large \cos(x) \sqrt{\sec^3(2x)}$

Which of the following is the antiderivative of the function above? Ignore arbitrary constant.

$$A: \sqrt{\frac{\sec(2x)-1}{2}}$$

$$B: \sqrt{\frac{\sec(2x)+ 1}{2}}$$

$$C: \sqrt{\frac{\sec(2x)+ 2}{2}}$$

$$D: \sqrt{\frac{\sec(2x)}{2}}$$

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