C. 21 / 21
ExplanationStep 1: Derivative of a linear expression equals coefficient of x. Step 2: Derivative of 21x is 21 and derivative of 8 is 0. Step 3: Derivative of a constant is zero.
Step 1: Linear expression का derivative x के coefficient के बराबर होता है। Step 2: 21x का derivative 21 और 8 का derivative 0 है। Step 3: Constant का derivative zero होता है।
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