Use a double angle formula to rewrite the given expression. 
Definitions:
Obstetricians
Medical doctors specializing in the care of women during pregnancy, childbirth, and the postpartum period.
Biological Sex
The classification of living beings, typically as male or female, based on the structure of reproductive organs and genetic characteristics.
TDF
Tenofovir Disoproxil Fumarate is a medication used to treat HIV and chronic hepatitis B.
Gene
A unit of heredity that is transferred from a parent to offspring and is held to determine some characteristic of the offspring.
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