Evaluate:
To find: 
Formula Used: 
Let y = (1 – 9x) … (1)
Differentiating with respect to x,
i.e., dy = -9 dx
Substituting in the equation to evaluate,
Simplifying and substituting the value of y from (1),
Therefore,
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Generated by AI. May contain inaccuracies — always verify with your textbook.
