1 . ddxcosx

• A. $-\sin \sqrt{x}$
• B. $\frac{-\sin \sqrt{x}}{2\sqrt{x}}$
• C. $\frac{-\sin \sqrt{x}}{\sqrt{x}}$
• D. $\frac{\sin \sqrt{x}}{2\sqrt{x}}$

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Answer: Option B

Explanation: