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