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The function is .
Find and .
Apply derivative on each side with respect to .
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Again derivative on each side with respect to .
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Substitute in .
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Substitute in .
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Substitute in .
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, and .
The functions are and .
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Consider .
Substitute , and .
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Substitute in above equation.
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Consider .
Substitute , and .
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Substitute in above equation.
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Therefore, the values of , and are equal at .
Graph the functions , and .
Observe the graph:
The values of , and are equal at .
The values of , and and their first derivatives agree at .
The values of , and and their first derivatives agree at .
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