Find an equation of the tangent line to the graph of f at the given point. 
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Definitions:
Sexual Desires
The natural or emotional urge that leads to sexual interest or attraction towards others.
Empty-nest Syndrome
A feeling of loneliness or depression that may occur among parents after their children have grown up and left home.
Androgens
Hormones that stimulate or control the development and maintenance of male characteristics in vertebrates by binding to androgen receptors.
Pepsinogens
Precursor enzymes produced by the stomach that, when activated, play a key role in breaking down proteins during digestion.
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