Examlex
Find the derivative of the function at the given value of x.
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User Cost
The economic cost of using a resource today, which considers the lost opportunity of using it in the future.
Energy
The capacity to do work, manifested in physical forms such as heat, light, motion, and chemical energy, crucial to all aspects of life and industry.
Forests
Large areas covered chiefly with trees and undergrowth, considered in economic terms as a resource for timber, recreation, and ecological benefits.
Elephants
Large mammals found in Africa and Asia known for their intelligence, long trunks, and large ears.
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Q193: <span class="ql-formula" data-value="\left\{ \begin{array} { l }
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