Find the derivative of the following function. 
Definitions:
Scrotum
The pouch of skin that contains and protects the testicles, as well as regulates their temperature.
Penis
The male external genitalia that serves as both the organ of sexual intercourse and the passageway for urine to leave the body.
Testis
The male reproductive gland that produces sperm and testosterone, located in the scrotum.
Ductus Deferens
A tube that carries sperm from the testes to the urethra in male mammals.
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