B. -cosec²x
ExplanationStep 1: This is a standard trigonometric derivative. Step 2: Derivative of cot x is -cosec²x. Step 3: Remember the negative sign in derivative of cot.
Step 1: यह standard trigonometric derivative है। Step 2: cot x का derivative -cosec²x होता है। Step 3: cot derivative में negative sign याद रखें।
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