To find: The value .
The value of .
The equation is .
(1) Chain rule: If and are both differentiable function, then
(2) Product Rule: If and are both differentiable, then
Obtain the value of .
Differentiate with respect to x on both sides,
Apply the product rule and simplify the terms,
Let and apply the chain rule (1),
Substitute in the above equation,
Substitute 0 for x in ,
Therefore, the value of .
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