Find the partial derivative 
for the function 
.
Definitions:
Endometrium
The inner lining of the uterus, which thickens during the menstrual cycle in preparation for possible implantation of an embryo.
PDE-5 Enzyme
An enzyme that breaks down cyclic GMP, regulating blood flow in the penis and thus playing a crucial role in erectile function.
Seminal Fluid
The fluid part of semen, produced by various male reproductive glands, providing a medium for sperm transport and nutrients for sperm vitality.
Viagra
A pharmaceutical drug used primarily in the treatment of erectile dysfunction, working by increasing blood flow to the penis.
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