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