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In , m
= 90 ° . If s = 4 and t = 5, find the exact value of cos S .
Cell Recognition
A biological mechanism through which cells identify and interact with each other, playing a critical role in immune response, cellular adhesion, and communication.
Radioactive Isotopes
Atoms of the same element with different numbers of neutrons, making them unstable and subject to radioactive decay.
Cell Membranes
Biological membranes that separate and protect the interior of a cell from its surrounding environment, consisting of a lipid bilayer with embedded proteins.
Human Cells
The basic structural, functional, and biological units of the human body, essential to all of the body's processes and functions.
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