B. 9 / 9
ExplanationStep 1: Derivative of a linear expression equals the coefficient of x. Step 2: Derivative of 9x is 9 and derivative of 2 is 0. Step 3: Remember derivative of a constant is zero.
Step 1: Linear expression का derivative x के coefficient के बराबर होता है। Step 2: 9x का derivative 9 और 2 का derivative 0 है। Step 3: Constant का derivative zero याद रखें।
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