Simplify the expression.(Assume that r, s, and t are positive.) 
Definitions:
Angiotensin-Converting Enzyme
A key enzyme in the renin-angiotensin system, involved in regulating blood pressure by converting angiotensin I to the potent vasoconstrictor angiotensin II.
Hypertension
A chronic medical condition characterized by persistently elevated blood pressure in the arteries, leading to increased risk of heart disease, stroke, and other health issues.
Dizziness
A sensation of spinning or lightheadedness, which may result in a loss of balance.
Cardiopulmonary Resuscitation
An emergency procedure consisting of external chest compressions and artificial ventilation to manually preserve intact brain function until further measures to restore spontaneous blood circulation and breathing in a person who is in cardiac arrest.
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