Find the point(s) on the curve where the tangent is horizontal. 
Definitions:
Fertilization
Impregnation of the ovum by the sperm; conception.
Ovulation
The phase of the menstrual cycle during which a mature egg is released from the ovary into the fallopian tube for potential fertilization.
Uterus
A muscular, hollow, pear-shaped organ of the female reproductive tract in which a fertilized ovum develops into a baby.
Syphilis
A communicable venereal disease spread by sexual contact.
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