B. -cosec² x
ExplanationStep 1: Identify the concept: this is trigonometric derivative. Step 2: The derivative of cot x is -cosec² x. Step 3: Remember minus cosec square for derivative of cot.
Step 1: concept पहचानें: यह trigonometric derivative है। Step 2: cot x का derivative -cosec² x होता है। Step 3: cot derivative में minus cosec square याद रखें।
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